A list of all our privacy-preserving, lightweight browser-based tools. All tools run directly in your browser without uploading any data to our servers.
| Tool Name | Description | Category | Link |
|---|---|---|---|
| ⭐ Add Text to Image | Add text to any image. Your image never leaves your device. | Image & Graphics | Launch |
| ⭐ Meme Generator | Add top & bottom captions, drag to position, and export a PNG — all in your browser. | Image & Graphics | Launch |
| ⭐ QR Code Generator | Turn any text into a QR code instantly. | Image & Graphics | Launch |
| ⭐ Barcode Generator | Create Code-128 or EAN-13 barcodes and export as SVG/PNG. | Image & Graphics | Launch |
| ⭐ Image Resizer & Converter | Resize and convert images between various formats while preserving aspect ratio. | Image & Graphics | Launch |
| ⭐ Batch Image Resizer & Converter | Process multiple images (up to 10) in batch with global resizing and ZIP download. | Image & Graphics | Launch |
| ⭐ Wallpaper Generator | Crop once, then export wallpapers in multiple ratios & resolutions for PC, mobile, and ultrawide — all client-side with ZIP download. | Image & Graphics | Launch |
| ⭐ Crop Image | Crop any image with precision directly in your browser. No upload needed. | Image & Graphics | Launch |
| ⭐ Compress Image Quality | Compress images with adjustable quality and format. Instant preview. Fully offline. | Image & Graphics | Launch |
| ⭐ Online Whiteboard Drawing Board | A simple, client-side canvas for quick sketches, diagrams, and image export. | Image & Graphics | Launch |
| ⭐ Image Placeholder Generator | Generate custom image placeholders with dimensions and text overlay. | Image & Graphics | Launch |
| ⭐ Image Watermark Tool | Add text or logo watermarks with opacity, position, rotation, and tiling. | Image & Graphics | Launch |
| ⭐ Flashcard Generator | Create and import flashcards (CSV), edit as a list, and export a cut-ready PDF with duplex fronts/backs. Private, client-side. | Image & Graphics | Launch |
| ⭐ BPM to Delay Time Calculator | Convert BPM to milliseconds and Hertz for straight, dotted, and triplet note values so delays and reverbs stay on-grid. | Studio Tools | Launch |
| ⭐ Audio File Size Calculator | Estimate WAV/PCM storage from sample rate, bit depth, channels, and duration with live MB/GB and data rate output. | Studio Tools | Launch |
| ⭐ Sample Rate Calculator | Compare two sample rates and bit depths to see Nyquist frequency, theoretical SNR, and bandwidth change before switching. | Studio Tools | Launch |
| ⭐ Video Bitrate & Streaming Calculator | Pick a video bitrate range that fits your upload bandwidth with headroom for stability; includes presets for 720p-4K and an audio allowance reminder. | Studio Tools | Launch |
| ⭐ Footage Storage Calculator | Estimate drive space for ProRes, H.264/H.265, or any custom bitrate across your shoot duration, with per-hour and TB/GB totals. | Studio Tools | Launch |
| ⭐ Aspect Ratio Calculator | Enter any ratio and one side to solve the matching pixel width or height, with presets for 16:9, 2.39:1, 4:3, 1:1, and vertical formats. | Studio Tools | Launch |
| ⭐ Timelapse Calculator | Enter scene duration, target clip length, and FPS to get the required interval, frame count, and slack time for smooth timelapses. | Studio Tools | Launch |
| ⭐ Microphone Sensitivity Calculator | Convert microphone sensitivity between dBV/Pa and mV/Pa with quick interpretation for how much preamp gain you will need. | Studio Tools | Launch |
| ⭐ Depth of Field Calculator | See near/far limits, total depth of field, and hyperfocal distance for your lens, aperture, focus distance, and sensor format. | Studio Tools | Launch |
| ⭐ Field of View Calculator | Compute horizontal, vertical, and diagonal FOV plus frame coverage at distance for any focal length and supported sensor size. | Studio Tools | Launch |
| ⭐ FPS to Hertz Calculator | Convert FPS to Hz, see frame time in milliseconds, and check how well it matches your monitor refresh—fully local. | Studio Tools | Launch |
| ⭐ Mouse Sensitivity Converter | Convert mouse sensitivity between Valorant, CS:GO/CS2, Overwatch 2, and Apex using yaw coefficients to keep cm/360 and eDPI consistent. | Studio Tools | Launch |
| ⭐ Crop Factor Calculator | Convert between Full Frame, APS-C (1.5×/1.6×), and Micro Four Thirds to see 35mm equivalents and the matching focal length on another format. | Studio Tools | Launch |
| ⭐ PDF Redaction (Burn-in) | Draw boxes to permanently remove sensitive content. Burn-in redactions—private, in-browser. | PDF & Documents | Launch |
| ⭐ PDF Reorder & Rotate | Drag pages to reorder, rotate 90°/180°, delete unwanted pages, then export. Private, runs in-browser. | PDF & Documents | Launch |
| ⭐ Markdown to PDF | Convert Markdown to printable PDFs with GitHub-style rendering and syntax highlighting. All client-side, private, in-browser. | PDF & Documents | Launch |
| ⭐ PDF to Image splitter | Split a PDF file into individual images and save selected images or all of them in one click. | PDF & Documents | Launch |
| ⭐ PDF Merger | Combine multiple PDF files into one single document. No server upload. | PDF & Documents | Launch |
| ⭐ PDF Compressor | Shrink PDF files instantly in your browser—no uploads required. | PDF & Documents | Launch |
| ⭐ PDF Text Extractor | Extract all selectable text from your PDF files directly in the browser. | PDF & Documents | Launch |
| ⭐ Word Counter | Count words, characters, numbers, and more in your text. | Text Processing | Launch |
| ⭐ Text Case Converter | Convert text to CAPITAL, lowercase, capitalized, sentence case, and alternating case. | Text Processing | Launch |
| ⭐ Alphabetic Numeric Sorter | Alphabetically or numerically sort lines of text. | Text Processing | Launch |
| ⭐ Line Break & Whitespace Cleaner | Remove all or reduce multiple line breaks and excess whitespace from your text. | Text Processing | Launch |
| ⭐ Duplicate Line Remover | Remove identical lines from your text with options for case and whitespace. | Text Processing | Launch |
| ⭐ Text Diff Viewer | Compare two texts and highlight differences. | Text Processing | Launch |
| ⭐ CSV Viewer with Filters & Sort | Upload, view, sort, and filter CSV data instantly in your browser for quick analysis. | Text Processing | Launch |
| ⭐ Readability Score Calculator | Analyze text for its readability level using Flesch-Kincaid and other metrics. | Text Processing | Launch |
| ⭐ Keyword Density Checker | Analyze the frequency of keywords and phrases in your text for SEO. | Text Processing | Launch |
| ⭐ Text Replacement Tool | Find and replace text instantly and privately in your browser. | Text Processing | Launch |
| ⭐ Zalgo Glitch Text Generator | Transform your text into unsettling, glitched Zalgo text. | Text Processing | Launch |
| ⭐ Levenshtein Distance (Edit Distance) | Compare two strings and highlight insertions, deletions, and substitutions. | Text Processing | Launch |
| ⭐ GPA Calculator | Calculate your GPA for high school or college, including cumulative and "what do I need" options. | Calculators | Launch |
| ⭐ SAT↔ACT Converter & GRE↔GMAT Comparator | Convert SAT↔ACT using the official 2018 concordance, and estimate GRE→GMAT (Focus & legacy) via percentile matching. Private, client-side. | Calculators | Launch |
| ⭐ BMI Calculator | Calculate your Body Mass Index (BMI) using imperial or metric units. | Calculators | Launch |
| ⭐ BMI vs Body Fat % | Compare BMI with estimated body fat % (US Navy & Deurenberg), metric/imperial, plus a mini chart. | Calculators | Launch |
| ⭐ BMR Calculator | Estimate your Basal Metabolic Rate (BMR) with multiple formulas and quick TDEE multipliers. | Calculators | Launch |
| ⭐ Calorie (TDEE) Calculator | Estimate your Total Daily Energy Expenditure (TDEE) with activity multipliers and calorie goals. | Calculators | Launch |
| ⭐ Calories Burned by Activity | Estimate calories burned from METs using your weight and time. Metric/imperial; private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Ideal Weight Calculator | Broca, Devine, Hamwi, and Robinson formulas with metric/imperial inputs and an optional ±10% frame-size adjustment. Private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Blood Pressure Zone Calculator | ACC/AHA (US) and NICE (UK) classification for clinic, home, or ambulatory readings, with a clear visual zone bar. Private, client-side. | Science & Engineering | Launch |
| ⭐ Blood Sugar / HbA1c Converter | NGSP % ↔ IFCC mmol/mol with eAG in mg/dL ↔ mmol/L. Clear UI, instant results, 100% client-side. | Health & Fitness Calculators | Launch |
| ⭐ Cholesterol Ratio & Risk Calculator | Calculate Total/HDL, LDL/HDL, Non-HDL cholesterol, and AIP (atherogenic index). Private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Child Growth Percentiles (CDC & WHO) | Friendly growth percentiles using WHO (0–5y) and CDC (2–20y) LMS standards. Weight, length/height, BMI, head circumference. Private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Water Intake Calculator | Estimate daily water needs using weight-based baselines with exercise, climate, altitude, and pregnancy/lactation adjustments. Private, client-side. | Health & Fitness Calculators | Launch |
| ⭐ Heart Beats Counter | Estimate daily, yearly, and lifetime heartbeats, see beats saved by lowering bpm, and compare to animals with very different heart rates. | Health & Fitness Calculators | Launch |
| 🎂 Birthday Countdown | Live countdown to your next birthday with DOB dropdowns, leap-year handling, and shareable URL. Private, client-side. | Time & Date Tools | Launch |
| ⭐ Age Calculator | Calculate age in years, months, and days, and find time until next birthday. | Calculators | Launch |
| ⭐ Age in Weeks & Months Calculator | See age in whole weeks + days, calendar months + days, and decimal months — baby-friendly and private. | Calculators | Launch |
| ⭐ Age Difference Calculator | Exact difference between two birthdays in years, months, and days, plus totals in days/weeks. Private, client-side. | Time & Date Tools | Launch |
| 🎂 Birthday Paradox Calculator | Probability that at least two people share a birthday in a group; leap-day toggle, odds, and quick thresholds. Private, client-side. | Calculators | Launch |
| ⭐ Browser Info Tool | Show IP address, browser type, screen size, and user agent for tech support and debugging. | Web Development | Launch |
| ⭐ HTML Colour Picker | Pick a colour from a palette and get its Hex, RGB, and HSL codes. | Web Development | Launch |
| ⭐ Markdown to HTML Converter | Convert Markdown text to HTML instantly. | Web Development | Launch |
| ⭐ Base64 Encoder / Decoder | Encode and decode text to and from Base64. | Web Development | Launch |
| ⭐ Image to Base64 Converter | Convert any image to a Base64 string in your browser. Copy or download instantly. | Web Development | Launch |
| ⭐ Timestamp Converter | Convert UNIX timestamps to human-readable dates and vice versa. | Web Development | Launch |
| ⭐ LDAP / FILETIME Converter | Convert 18-digit LDAP/Windows FILETIME ↔ Date. Decimal & hex, UTC/local display, AD “Never” handled. | Time & Date Tools | Launch |
| ⭐ Apple Cocoa/Core Foundation Time | Convert CFAbsoluteTime/NSTimeInterval (seconds since 2001-01-01 UTC) to dates and back — fractional seconds preserved. | Time & Date Tools | Launch |
| ⭐ Unix Hex Timestamp Converter | Convert Unix timestamps in hex or decimal (seconds or milliseconds) to dates and back — auto-detect with override. | Time & Date Tools | Launch |
| ⭐ Mac HFS+ Timestamp Converter | Convert HFS+ timestamps (seconds since 1904-01-01 UTC) to dates and back — hex/decimal input, optional byte-swap. | Time & Date Tools | Launch |
| ⭐ SAS Timestamp Converter | Convert SAS datetime (seconds since 1960) or SAS date (days since 1960) ↔ human dates. Hex/decimal, fractional seconds. | Time & Date Tools | Launch |
| ⭐ JSON Formatter & Validator | Pretty-print, minify, and validate JSON data instantly in your browser. | Web Development | Launch |
| ⭐ URL Encoder/Decoder | Encode or decode special characters in URLs. | Web Development | Launch |
| ⭐ Hash Generator (MD5, SHA1, SHA256) | Generate MD5, SHA1, and SHA256 cryptographic hashes of text strings. | Web Development | Launch |
| ⭐ Password Strength Checker | Estimate strength, entropy & crack time with optional PBKDF2 timing — all client-side. | Web Development | Launch |
| ⭐ Blank Markdown Table Generator | Visually create blank Markdown tables by selecting your desired rows and columns. | Web Development | Launch |
| ⭐ Regex Tester | Test and build regular expressions against sample text with live highlighting. | Web Development | Launch |
| ⭐ Time Since/Until Calculator | Calculate the duration (years, months, weeks, days, hours, minutes, seconds) since or until a specific date and time. | Web Development | Launch |
| ⭐ Time Zone Converter | Convert a date & time across 2–3 time zones — DST-safe with 12/24-hour format, overlap suggestions, and a copyable link. | Web Development | Launch |
| ⭐ Printable Monthly Calendar | Generate clean A4/Letter calendars with Monday/Sunday start, ISO week numbers, notes & mini-months. Print or save as PDF — 100% client-side. | Time & Date Tools | Launch |
| ⭐ ISO Week Number Converter | Convert date ↔ ISO week/year and weekday (Mon–Sun), with full week range and 52/53-week validation. Fast, accurate, and 100% client-side for privacy. | Time & Date Tools | Launch |
| ⭐ Day-of-Year ⇄ Date & Weekday Converter | Convert day-of-year (1–365/366) ↔ calendar date and instantly see the weekday. Leap-year aware, UTC-safe, and 100% client-side for privacy. | Time & Date Tools | Launch |
| ⭐ Holiday Countdown | See days, hours, minutes, and seconds until popular fixed-date holidays (Christmas, Halloween, etc.). Includes a custom date countdown. Private, client-side. | Time & Date Tools | Launch |
| ⭐ Add/Subtract Business Days (+ Custom Holidays) | Add or subtract business days with weekend toggles and custom holiday upload. Leap-year aware, UTC-safe, and 100% client-side for privacy. | Time & Date Tools | Launch |
| ⭐ Cron Expression Generator & Parser | Generate or parse cron, view human-readable summaries, and preview next run times. Supports seconds/year and Quartz mode. Private, client-side. | Time & Date Tools | Launch |
| ⭐ Protein Isoelectric Point (pI) Calculator | Estimate pI and net charge across pH using selectable pKa sets (EMBOSS, Bjellqvist) or custom overrides. 100% private—runs in your browser. | Science & Engineering | Launch |
| ⭐ Meta Tag Generator | Create SEO, Open Graph, and Twitter meta tags with live preview. Copy or download a ready-to-use head block. | Web Development | Launch |
| ⭐ Robots.txt Builder | Build robots.txt with user-agent groups, Allow/Disallow rules, Sitemap URLs, and optional crawl-delay/Host. Copy or download. | Web Development | Launch |
| ⭐ CSS Gradient Generator | Create linear or radial gradients with multiple color stops, live preview, and one-click CSS copy. | Web Development | Launch |
| ⭐ Scientific Figure & Page Extractor | Extract high-quality images of figures and pages from research PDFs. | Science & Engineering | Launch |
| ⭐ Research Abstract Formatter | Format abstracts with IMRC headings, clean whitespace, and convert to HTML, Plain Text, or LaTeX. | Science & Engineering | Launch |
| ⭐ BioStats Quick Calculator v0.9 | Quickly calculate t-test, chi-square, or ANOVA for your biological data. | Science & Engineering | Launch |
| ⭐ DNA/Protein Sequence Cleaner + Validator | Clean and validate DNA/protein sequences, remove invalid characters, and ensure proper formatting. | Science & Engineering | Launch |
| ⭐ Blot Image Cleaner | Upload blot/gel images for auto-inversion, contrast enhancement, and noise removal. | Science & Engineering | Launch |
| ⭐ PCR Primer Calculator (Tm & GC%) | Compute primer Tm (Wallace, GC%, nearest-neighbor), GC%, GC clamp quality, and quick self-structure checks. Private, client-side. | Science & Engineering | Launch |
| ⭐ Molarity Calculator | Calculate mass, molecular weight, volume, or concentration for chemical solutions. | Science & Engineering | Launch |
| ⭐ Molecular Weight Calculator | Calculate molecular weight from chemical formulas or protein/DNA/RNA sequences. | Science & Engineering | Launch |
| ⭐ Moles ↔ Mass ↔ Volume (Gas at STP) | Convert between moles, grams, and gas volume using STP/IUPAC STP/SATP molar volume; can infer MW from mass + volume. | Science & Engineering | Launch |
| ⭐ Lab Dilution Planner — Serial Dilutions | Plan serial dilutions from stock to target with pipette limits, or build a fixed-fold ladder. Private, client-side. | Science & Engineering | Launch |
| ⭐ Enzyme Kinetics Calculator | Plot Michaelis–Menten and classic linearizations; fit Vmax & Km from your data. Private, client-side. | Science & Engineering | Launch |
| ⭐ Protein Concentration Calculator | Bradford & BCA standard curves and direct A280 (Beer–Lambert) with curve fitting, dilution, and path length. Private, client-side. | Science & Engineering | Launch |
| ⭐ Beer–Lambert Law (A = εlc) | Solve absorbance, molar absorptivity (ε), path length (l), or concentration (c). Includes %T ↔ A conversion and unit-aware inputs. 100% client-side. | Science & Engineering | Launch |
| ⭐ Henderson–Hasselbalch — Buffer pH | Compute pH from pKa and [A⁻]/[HA], or design a buffer recipe from target pH, total concentration, and volume. Unit-aware, with optional grams via molar masses. 100% client-side. | Science & Engineering | Launch |
| ⭐ Dilution Calculator (C1V1=C2V2) v1.1 | Calculate unknown concentrations or volumes using the C1V1=C2V2 formula. | Science & Engineering | Launch |
| ⭐ Sample Size Calculator | Determine the minimum sample size for comparative studies and A/B tests. | Science & Engineering | Launch |
| ⭐ Triangle Calculator | Solve any triangle by entering the three values that you know. | Calculators | Launch |
| ⭐ Trigonometric Triangle Solver | Solve any triangle (AAS, ASA, SAS, SSS, SSA) with Law of Sines/Cosines, degree/radian toggle, precision control, and ambiguous-case handling. Private, client-side. | Calculators | Launch |
| ⭐ Heron’s Formula Calculator | Triangle area from three sides using Heron’s formula, plus semiperimeter, inradius, circumradius, and altitudes. Private, client-side. | Calculators | Launch |
| ⭐ Pythagorean Triples Generator | Generate Pythagorean triples (a, b, c) with a²+b²=c². Primitive/all multiples, filters, live diagram, CSV export. Private, client-side. | Geometry | Launch |
| ⭐ Circle Calculator | Compute radius, diameter, circumference, and area from any one value. Supports units, decimal places, and π precision. | Calculators | Launch |
| ⭐ Ellipse Area & Perimeter Calculator | Compute ellipse area (πab) and perimeter using Ramanujan I, Ramanujan II, and a high-precision elliptic-integral series. Works from a, b, A, B, area, or eccentricity. Private, client-side. | Calculators | Launch |
| ⭐ Square Calculator | Compute side, diagonal, perimeter, area, inradius, and circumradius from any one value. Units & decimal places. Private, client-side. | Calculators | Launch |
| ⭐ Rectangle Calculator | Compute width, height, diagonal, perimeter, area, and circumradius from any two values. Units & decimals. Private, client-side. | Calculators | Launch |
| ⭐ Trapezoid Calculator | Enter bases, legs, or height to get area, perimeter, diagonals & midline. General / isosceles / right. Private, client-side. | Geometry | Launch |
| 🧊 Cube Calculator | Compute edge length, surface area, volume, and space diagonal from any one value. Private, client-side. | Calculators | Launch |
| 🛢️ Cylinder Calculator | Compute radius/diameter, height, surface area, lateral area, and volume from any two values. Private, client-side. | Calculators | Launch |
| 🎯 Cone Calculator | Compute radius/diameter, height, slant height, surface area, lateral area, and volume from any two values. Private, client-side. | Calculators | Launch |
| 🌐 Sphere Calculator | Compute radius/diameter, surface area, and volume from any one value. Choose units, decimals, and π precision. Private, client-side. | Calculators | Launch |
| ⭐ Pyramid Calculator | Surface area, volume, height, and slant height for regular pyramids. Private, client-side. | Calculators | Launch |
| ⭐ Regular Polygon Calculator | Area, perimeter, side/apothem, circumradius, and angles for an n-gon. Private, client-side. | Calculators | Launch |
| ⭐ Irregular Polygon Area Calculator | Compute area (shoelace), perimeter, centroid, and orientation from vertex coordinates. Private, client-side. | Calculators | Launch |
| ⭐ Polygon Interior/Exterior Angles Calculator | Compute per-vertex interior and signed exterior angles, plus sums and orientation. Regular or custom coordinates. Private, client-side. | Calculators | Launch |
| ⭐ Conic Equation Finder | Compute equations for circles, parabolas, ellipses, and hyperbolas from points, foci, directrix, or parameters. Private, client-side. | Geometry | Launch |
| ⭐ Quadratic Equation Calculator | Solve quadratic equations (ax² + bx + c = 0) and see the step-by-step solution. | Calculators | Launch |
| ⭐ Ratio Calculator | Solve for a missing ratio value and visualize the relationship. | Calculators | Launch |
| ⭐ Fraction Calculator | Add, subtract, multiply, and divide fractions & mixed numbers with step-by-step simplification. | Calculators | Launch |
| ⭐ Proportion Calculator | Solve proportions step by step — find the missing value in “a is to b as c is to ?”. | Calculators | Launch |
| ⭐ Percentage Calculator | Find the percentage of a number, determine percentages, and more. | Calculators | Launch |
| ⭐ Percentage Change Calculator | Quantify the increase or decrease between two values. | Calculators | Launch |
| ⭐ Mean, Median, Mode Calculator | Calculate the mean, median, mode, range, and other key statistics for a set of numbers. | Calculators | Launch |
| ⭐ Average (Mean) Calculator | Quickly compute the arithmetic mean of numbers with support for spaces, commas, and new lines. | Calculators | Launch |
| ⭐ Standard Deviation & Z-Score Calculator | Paste numbers to get mean, variance, standard deviation (population/sample), and per-value z-scores — all client-side. | Calculators | Launch |
| ⭐ Binomial & Poisson Calculator | Enter n,p,k (or λ,k) to compute PMF, CDF, expected value, variance, and view a probability bar chart — all client-side. | Calculators | Launch |
| ⭐ Exponent / Power Calculator (xy) | Calculate powers like 25 or 10-3 in a kid-friendly xy layout. Supports negatives, zero exponents, and scientific notation. | Calculators | Launch |
| ⭐ Prime Factorization Calculator | Check if a number is prime and get its full prime factorization with exponents — instant, private, and student-friendly. | Calculators | Launch |
| ⭐ Scientific Notation Converter | Convert standard ↔ scientific (a × 10n) & engineering notation. Handles E-notation and significant figures — 100% client-side. | Calculators | Launch |
| ⭐ Logarithm Calculator | Compute ln, log10, log2, and log base b; includes change-of-base and antilog — 100% client-side. | Calculators | Launch |
| ⭐ Permutation & Combination Calculator | Compute permutations (nPr) and combinations (nCr) — with or without repetition, exact BigInt results plus approximation. | Calculators | Launch |
| ⭐ LCM & GCF Calculator | Find least common multiple (LCM) and greatest common factor (GCF/HCF) of any integers — supports negatives, zero, and BigInt for large values. | Calculators | Launch |
| ⭐ APR ↔ APY Converter & CAGR | Convert APR⇄APY with custom, daily (360/365), and continuous compounding, plus calculate CAGR instantly. | Calculators | Launch |
| ⭐ NPV & IRR Calculator | Compute NPV & IRR from a cash-flow table; switch between equal periods or exact dates (XNPV/XIRR), with CSV import/export — 100% client-side. | Calculators | Launch |
| ⭐ Perpetuity Calculator | Compute present value (PV) for level, due, or growing perpetuities — or solve for cash flow (C), discount rate (r), or growth (g). 100% client-side. | Calculators | Launch |
| ⭐ Mortgage Repayment Calculator | Estimate loan payments, total interest, and view a full amortization schedule. | Calculators | Launch |
| ⭐ Mortgage vs Renting Calculator | Compare buying vs renting over time—monthly costs, equity, and cumulative net cost with a simple chart. | Calculators | Launch |
| ⭐ Loan Calculator | Calculate monthly payments and view a full repayment schedule. | Calculators | Launch |
| ⭐ Loan Comparison | Compare two loans side by side, add extra payments, and see early payoff savings. | Calculators | Launch |
| ⭐ Auto Loan Calculator | Estimate car payments with down payment, trade-in, taxes, fees, APR, and term. Includes amortization schedule. | Calculators | Launch |
| ⭐ Debt Snowball & Avalanche Calculator | Prioritize debts via Snowball or Avalanche, apply extra budget, and see payoff dates, total interest, and a month-by-month schedule. Private, client-side. | Financial Calculators | Launch |
| ⭐ Debt Avalanche Calculator | Prioritize highest APR balances to minimize interest. Enter debts, add extra budget, and view your payoff schedule. Private, client-side. | Financial Calculators | Launch |
| ⭐ Minimum Credit Card Payment Calculator | Estimate minimum payment, payoff time, and total interest. Supports “% of balance” or “greater of %/fixed”. Private, client-side. | Financial Calculators | Launch |
| ⭐ Debt Consolidation Calculator | See if a consolidation loan could lower your monthly payment or total interest. Compare APR, term, and fees vs. current debts. Private, client-side. | Financial Calculators | Launch |
| ⭐ Debt-to-Income (DTI) Ratio Calculator | Calculate housing (front-end) and total (back-end) DTI with monthly or annual income. Includes friendly thresholds and guidance. Private, client-side. | Financial Calculators | Launch |
| ⭐ Loan Affordability Calculator | Estimate maximum affordable payment, loan amount, and (in mortgage mode) home price from income, debts, and DTI caps. Private, client-side. | Financial Calculators | Launch |
| ⭐ Refinance Break-Even Calculator | Compare old vs new payment, costs & points, and see months to break even plus interest over your hold period. Private, client-side. | Financial Calculators | Launch |
| ⭐ Credit Card Payoff Time Calculator | Project months to payoff from a fixed payment, estimate total interest, and export an amortization table. Private, client-side. | Financial Calculators | Launch |
| ⭐ New vs Old Car Cost Calculator | Compare total cost of ownership: purchase/financing, fuel or electricity, maintenance, insurance, fees, and resale. Shows NPV, EAC, and cost per mile. | Calculators | Launch |
| ⭐ Car Insurance Cost Estimator | Estimate an illustrative annual premium with a clear factor breakdown. Currency & tax settings, CSV export. Private, client-side (not a quote). | Calculators | Launch |
| ⭐ Life Insurance Calculator | Educational level-term premium estimator using survival probabilities & present-value math. Shows net & illustrative gross premiums, death-in-term probability, and CSV export. Private, client-side (not a quote). | Calculators | Launch |
| ⭐ Health & Fitness Calculators Insurance Cost Estimator | Educational tool that estimates your total annual cost: premiums + out-of-pocket under deductible, copays, coinsurance, and OOP maximum. Clear line-by-line breakdown, flow-through visualization, scenario presets, and CSV export. Private, client-side (not a quote). | Calculators | Launch |
| ⭐ Dental Insurance Cost Estimator | Educational tool that estimates your annual dental cost: premiums + your share after deductible and class coinsurance, with plan-side caps (annual max) and orthodontic lifetime max. Shows Preventive/Basic/Major/Ortho breakdown, waiting-period toggles, clear table outputs, and CSV export. Private, client-side (not a quote). | Calculators | Launch |
| ⭐ Travel Insurance Cost Estimator | Educational single-trip premium estimator with transparent factors: duration, destination region, age, medical limit, excess, sports/activities, baggage, and cancellation. Shows clear breakdown, risk multiplier, presets, and CSV export. Private, client-side (not a quote). | Calculators | Launch |
| ⭐ Business Insurance Calculator | Transparent, educational estimator for GL, Property, Workers’ Comp, and Professional/Cyber. Exposure × base rate with clear factor breakdown (limits, deductibles, territory, experience), minimum premium/fees, taxes, and CSV export. Private, client-side (not a quote). | Calculators | Launch |
| 🏠 House Insurance Cost Estimator | Transparent, educational estimator for Buildings & Contents with clear multipliers (rebuild cost, contents, construction, roof age, security, flood/wind/crime, occupancy, claims), optional endorsements, excess/deductible effects, taxes, and CSV export. Private, client-side (not a quote). | Calculators | Launch |
| 🏢 Apartment / Flat Insurance Estimator | Estimate an illustrative annual premium with a transparent factor breakdown (contents, floor level, sprinklers, security, location, excess). Currency & tax settings, CSV export. Private, client-side (not a quote). | Calculators | Launch |
| 🧳 Renters Insurance Cost Estimator | Educational HO-4/tenant tool estimating an illustrative annual premium with a transparent factor breakdown (contents limit, building type, floor level, security & crime, deductible, liability, endorsements/discounts). Currency & tax settings, CSV export. Private, client-side (not a quote). | Calculators | Launch |
| 🐾 Pet Insurance Cost Estimator | Estimate an illustrative monthly & annual premium with a transparent factor breakdown (species, breed risk, age, weight, vet-cost index, limit, reimbursement, deductible). CSV export. Private, client-side (not a quote). | Calculators | Launch |
| ⭐ Bitcoin Unit Converter | Instantly convert BTC ↔ satoshi ↔ mBTC ↔ μBTC. Privacy-first, client-side math. | Financial Calculators | Launch |
| ⭐ Mining Profitability Calculator | Estimate revenue, electricity cost, profit, and ROI from hashrate, power, price/kWh, difficulty, and block reward. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto Transaction Fee Calculator | Tx size (bytes) × sat/vB → fee in sats, BTC, and fiat using your BTC price. No APIs; fully client-side. | Financial Calculators | Launch |
| ⭐ Crypto Portfolio Diversification Calculator | Enter holdings and prices to see allocations, concentration, and an equal-weight rebalance suggestion. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto Staking Rewards Calculator | Estimate staking rewards and final balance from amount, APY %, and time. Fixed-rate assumption, 100% client-side. | Financial Calculators | Launch |
| ⭐ Crypto Profit/Loss Calculator | Compute absolute P/L, ROI %, breakeven sell price, and fee breakdown from buy/sell price, quantity, and fees. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto Loan Collateral Calculator | Loan amount + target LTV + liquidation threshold → required collateral value, overcollateralization, and buffer to liquidation. Optional price to show units and liquidation price. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto DCA Calculator | Plan dollar-cost averaging with recurring amount, frequency, fees, and prices. Shows total invested, total units, average cost basis, and unrealized P/L. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto Retirement Calculator | Monthly DCA, projected growth rate, and a target balance → estimated months and years to goal. Private, client-side. | Financial Calculators | Launch |
| ⭐ HODL Time Value Calculator | Initial amount, time held, and final value → ROI, annualized CAGR, and comparison to a benchmark return. Private, client-side. | Financial Calculators | Launch |
| ⭐ Crypto Impermanent Loss Calculator | Price change in a 50/50 AMM pair → impermanent loss %, LP value, and HODL comparison. Educational, client-side. | Financial Calculators | Launch |
| ⭐ Amortization Calculator | Calculate fixed loan payments, total interest, and generate an amortization schedule. Supports multiple currencies and flexible terms (days, months, years). | Calculators | Launch |
| ⭐ Payback Time Calculator | Measure how long it takes to recover an investment with simple and discounted payback. Supports annual/monthly periods, constant or custom cash flows, CSV export, and a cumulative chart. | Calculators | Launch |
| ⭐ VAT & Sales Tax Calculator | Add or remove VAT (UK/EU) or sales tax (US). Choose standard, reduced, or zero rates—or override with your own value. Fully client-side for privacy. | Calculators | Launch |
| ⭐ Annuity PV/FV & Break-Even | Compute PV/FV for ordinary/due and growing annuities, plus break-even units & revenue, margin, and markup — with annual→per-period rate conversion. 100% client-side. | Calculators | Launch |
| ⭐ Discrete Compounding Calculator | PV/FV for lump sums & ordinary/due annuities, solve for rate or periods, plus APR↔EAR and periodic-rate helpers — 100% client-side. | Calculators | Launch |
| ⭐ Simple Interest Calculator | Calculate simple interest and the total amount instantly. | Calculators | Launch |
| ⭐ Simple vs Compound Interest | Compare simple vs compound interest side-by-side — totals, EAR, and a clean growth chart. | Calculators | Launch |
| ⭐ ROI Calculator | Calculate Return on Investment (ROI) and annualized returns. | Calculators | Launch |
| ⭐ ROI by Project / Business Line Calculator | Multi-project ROI with per-row fees, dates or duration, CAGR, and portfolio weighted ROI. 100% client-side. | Financial Calculators | Launch |
| ⭐ Rule of 72 Calculator | Estimate doubling time or required annual rate with the Rule of 72 and see the exact compounding comparison. Private, client-side. | Financial Calculators | Launch |
| ⭐ Tip Calculator | Quickly calculate tips, split bills, include/exclude tax, and apply rounding. | Calculators | Launch |
| ⭐ Restaurant Bill Splitter & Tip Calculator | Enter meals, prices, and quantities to split a restaurant check evenly. Add a tip by percent or fixed amount—mobile-friendly and private. | Calculators | Launch |
| ⭐ Shipping Cost Calculator — FOB vs CFR | Compute CIF, duty, VAT, insurance (110% uplift), destination fees, FX conversion, and per-unit landed cost—simple, client-side. | Calculators | Launch |
| ⭐ SIP Calculator | Estimate total invested, wealth gained, and maturity value for systematic investments. | Calculators | Launch |
| ⭐ CD Calculator | Calculate maturity value and interest earned from fixed-term deposits with APY/APR and compounding. | Calculators | Launch |
| ⭐ Discount Rates Calculator | Compare single vs. stacked discounts, compute the equivalent rate, and reverse-calc a target price — with optional sales tax. | Calculators | Launch |
| ⭐ Markup & Margin Calculator | Convert markup ↔ margin, price from cost, profit per unit, and compare scenarios — optional tax display. | Calculators | Launch |
| ⭐ ARR Calculator | Compute Accounting Rate of Return from average profit using initial or average investment, with simple or detailed mode (depreciation & tax). | Calculators | Launch |
| ⭐ One Rep Max Calculator | Estimate your one-repetition max using Epley, Brzycki, and Lombardi formulas. | Calculators | Launch |
| ⭐ Race Split Planner | Plan even or negative splits for 5K/10K/Half/Marathon with per-km/mi targets and CSV export. | Calculators | Launch |
| ⭐ Pace / Speed / Time | Enter any two (pace, speed, time, or distance) and compute the third — km/mi aware with instant conversions and CSV export. | Calculators | Launch |
| ⭐ AOE Calculator | Convert between your local time and AOE (UTC−12). Shows offset difference & day shift. DST-safe and fully client-side. | Time & Date Tools | Launch |
| ⭐ Date Calculator | Find days between dates (incl. business days) or add/subtract days, weeks, months, or years. | Calculators | Launch |
| ⭐ Workdays Calculator | Count workdays between two dates or add/subtract business days — optional holidays supported. | Time & Date Tools | Launch |
| ⭐ All-in-One Unit Converter | Convert length, mass, temperature, area, volume, speed, time, and digital storage — fully client-side for privacy. | Calculators | Launch |
| ⭐ Binary/Hex/Octal Converter | Convert between binary, octal, decimal, and hex — supports negatives, BigInt, prefixes, and 4-bit grouping. 100% client-side for privacy. | Calculators | Launch |
| ⭐ HTML Minifier & Beautifier | Minify HTML for smaller size or beautify for readability — all processed locally in your browser for privacy. | Web Development | Launch |
| ⭐ JavaScript Minifier & Beautifier | Minify JavaScript for faster load times or beautify for readability — fully client-side for privacy. | Web Development | Launch |
| ⭐ YAML to JSON Converter | Convert YAML to JSON instantly in your browser — 100% client-side for privacy and speed. | Web Development | Launch |
| ⭐ JWT Encoder | Build and sign JWTs (none, HS256, RS256) with easy time-claim helpers. Private, client-side. | Web Development | Launch |
| ⭐ JWT Decoder | Decode JWTs, view header/payload, check exp/nbf/iat, and verify HS256/RS256 signatures. Private, client-side. | Web Development | Launch |
| ⭐ Lorem Ipsum Generator | Generate Lorem Ipsum filler text by words, sentences, or paragraphs. Copy as plain, HTML, or Markdown — all client-side. | Web Development | Launch |
| ⭐ Stopwatch | Accurate stopwatch with laps, keyboard shortcuts, and CSV export — 100% client-side for privacy. | Time & Date Tools | Launch |
| ⭐ Sleep Calculator | Find the best bedtimes or wake-up times using 90-minute sleep cycles and a fall-asleep buffer — all client-side for privacy. | Time & Date Tools | Launch |
| ⭐ Countdown Timer | Set hours, minutes, and seconds, then run a smooth countdown with live milliseconds. Presets, Start/Pause/Reset, optional chime — all client-side. | Time & Date Tools | Launch |
| ⭐ Pomodoro Timer | Run calm focus/break cycles with session stats, streaks, chime, and desktop notifications. Private, client-side. | Time & Date Tools | Launch |
| ⭐ Beam Load Calculator | Compute support reactions, shear force, and bending moment diagrams for simply supported beams with point loads and UDLs. | Science & Engineering | Launch |
| ⭐ Engineering Tolerances Calculator | Hole & shaft limits, min/max clearance or interference, and fit classification from deviations or IT grades (H/h/js). Private, client-side. | Science & Engineering | Launch |
| ⭐ Fluid Flow Calculator | Calculate Reynolds number, velocity, and pipe diameter. Classify flow regime as laminar, transitional, or turbulent. | Science & Engineering | Launch |
| ⭐ Buoyancy Calculator | Buoyant force and floating depth (draft) from ρ, V, g. Optional Awp and mass/weight for equilibrium draft. Private, client-side. | Science & Engineering | Launch |
| ⭐ RC Time Constant Calculator | Compute τ = R·C and plot charging & discharging curves from an initial voltage. Unit-aware inputs. Private, client-side. | Science & Engineering | Launch |
| ⭐ Work, Power & Energy Calculator | Compute work from force, displacement & angle, average power from time, and efficiency from input energy/power. Private, client-side. | Science & Engineering | Launch |
| ⭐ Gravity & Newton’s Second Law | Calculate surface/altitude gravity (g), Earth-g, and weight; solve F = m·a. Presets for Solar System bodies or custom mass/radius. 100% client-side. | Science & Engineering | Launch |
| ⭐ Free Fall & Gravity Calculator | Compute time to hit ground, impact velocity, and kinetic energy from height. Presets for Earth, Moon, Mars, Jupiter; optional initial velocity & mass. 100% client-side. | Science & Engineering | Launch |
| ⭐ Acceleration Unit Converter | Convert m/s², g, ft/s², in/s², Gal/mGal/µGal, km/h/s, mph/s, and knot/s with adjustable precision, fixed/scientific notation, and one-click copy & share — all client-side. | Science & Engineering | Launch |
| ⭐ Projectile Motion Calculator | Compute range, time of flight, maximum height, apex distance & impact speed — presets for Earth/Moon/Mars, custom g, initial height, and speed in m/s, km/h, or mph. 100% client-side. | Science & Engineering | Launch |
| ⭐ Centripetal Force Calculator | Compute centripetal force, radial acceleration, and g-forces from mass, speed, and radius. Private, client-side. | Science & Engineering | Launch |
| ⭐ Kinetic & Potential Energy Calculator | Compute KE (½mv²), PE (mgh), total mechanical energy, and use conservation to find speed at a height or max height. Private, client-side. | Science & Engineering | Launch |
| ⭐ Spring Oscillator Calculator | Hooke’s Law force, SHM period/frequency (T, f, ω), and max potential energy from k, m, and x. Private, client-side. | Science & Engineering | Launch |
| ⭐ Resonance & Natural Frequency Calculator | Mass–spring–damper & RLC (series/parallel) resonance: ωₙ / fₙ, ζ, Q, α, damped frequency, and bandwidth. Private, client-side. | Science & Engineering | Launch |
| ⭐ Lens / Mirror Equation Calculator | Thin lens & spherical mirror calculator for image distance, magnification, and image nature. Private, client-side. | Science & Engineering | Launch |
| ⭐ Ideal Gas Law Calculator (PV = nRT) | Solve for P, V, n, or T with friendly units and STP/SATP presets. Includes Boyle’s, Charles’s, and Gay-Lussac two-state calculators. Private, client-side. | Science & Engineering | Launch |
| ⭐ Torque & Moment of Inertia Calculator | Torque from force & lever arm; I for solid sphere, cylinder/disk, or thin rod; angular acceleration and rotational KE. Private, client-side. | Science & Engineering | Launch |
| ⭐ Star Field Planetarium (In Development) | Explore a realistic 3D starry night sky with interactive controls. | Science & Engineering | Launch |
| ⭐ Redshift to Distance Calculator | Calculate Luminosity, Angular Diameter, and Comoving Distances from Redshift. | Science & Engineering | Launch |
| ⭐ De Broglie Wavelength Calculator | Matter-wave calculator using λ = h/(m·v); outputs in m/nm/pm plus momentum and KE, with an electron-vs-baseball comparison at the same speed. | Science & Engineering | Launch |
| ⭐ Photon Energy & Wavelength Calculator | Convert between photon energy, wavelength, and frequency (E = h·f, λ = c/f) with joules, eV, nm, Hz, and a visible spectrum marker. | Science & Engineering | Launch |
| ⭐ Compton Scattering Calculator | Compute Δλ = λC(1 − cos θ), final wavelength, and photon energy change for photon–electron scattering; includes X-ray backscatter and small-angle laser presets. | Science & Engineering | Launch |
| ⭐ Heisenberg Uncertainty Calculator | Check position–momentum and energy–time uncertainty against ħ/2, with minimum paired values, ratios, and a visual bound bar. | Science & Engineering | Launch |
| ⭐ Quantum Superposition State Visualizer | Bloch sphere plotter for single-qubit states from amplitudes or θ/φ, with live probabilities, presets, shareable links, and PNG export. | Science & Engineering | Launch |
| ⭐ Qubit vs Classical Bit Calculator | Show 2^n state growth, state-vector RAM at chosen bytes per amplitude, and how many qubits your available RAM can simulate (state-vector model). Runs entirely in your browser. | Science & Engineering | Launch |
| ⭐ Quantum Decoherence Time Calculator | Estimate collisional decoherence using pressure, temperature, particle size, Δx, and environment mass. Outputs collision rate, Γ, τ, and thermal λdB, with presets for air, vacuum, water, and space. | Science & Engineering | Launch |
| ⭐ Quantum Gate Truth Table Generator | Build 1–3 qubit circuits with Pauli, H, S/T, CNOT, CZ, and SWAP; see live truth tables, amplitudes, and Bell/GHZ/phase-kick presets. | Science & Engineering | Launch |
| ⭐ Quantum Tunneling Probability Calculator | Estimate barrier transmission with the textbook T ≈ exp(-2κa) for a 1D rectangular barrier. Enter mass (kg), barrier height and energy (eV), and width (nm); includes electron and alpha-decay examples. | Science & Engineering | Launch |
| ⭐ Quantum Entanglement Distance Calculator | Bell-CHSH S value with adjustable angles, distance, loss, detector efficiency, and visibility; shows coincidence rate and violation status. | Science & Engineering | Launch |
| ⭐ Casimir Effect Force Calculator | Compute Casimir vacuum pressure and force between parallel plates with unit-aware gap/area, a⁻⁴ scaling bar, and nano/micro presets. | Science & Engineering | Launch |
| ⭐ Zero-Point Energy Calculator | Estimate vacuum zero-point energy from density × volume with cosmological presets, mass equivalent, battery comparison, and optional cutoff model. | Science & Engineering | Launch |
| ⭐ Schrodinger Equation Solver (1D Box) | Infinite square-well energies E_n = n²h²/(8mL²), normalized wavefunctions, |psi|² visualization, and an energy ladder. | Science & Engineering | Launch |
| ⭐ Space Unit Converter | Instantly convert between Astronomical Units (AU), Light-Years (ly), Parsecs (pc), and Kilometers (km). | Science & Engineering | Launch |
| ⭐ Cosmology Calculator (Age & Distance) | Calculate the age of the universe and cosmic distances for a given redshift. | Science & Engineering | Launch |
| ⭐ Rocket Delta-V Calculator | Compute rocket Δv with up to 4 stages using the Tsiolkovsky equation — per-stage and total results with chart. | Science & Engineering | Launch |
| ⭐ Satellite Orbit Period Calculator | Enter altitude to calculate orbital period, orbital velocity, and revolutions per day using Kepler’s Third Law. | Science & Engineering | Launch |
| ⭐ Hohmann Transfer Calculator | Compute Δv₁, Δv₂, total Δv, and transfer time between circular orbits. Optional plane-change combination. | Science & Engineering | Launch |
| ⭐ Conway’s Game of Life | Interactive pixel-grid simulator of Conway’s Game of Life — draw, run, pause, and explore emergent patterns. | Science & Engineering | Launch |
| ⭐ Ant Colony Simulator | Interactive simulation of ant foraging behavior — watch pheromone trails emerge and tweak evaporation, diffusion, and agent count. | Science & Engineering | Launch |
| ⭐ Population Growth Simulator | Exponential vs logistic growth with adjustable N₀, r, K, Δt, and noise. Live chart, stats, and export. Private, client-side. | Science & Engineering | Launch |
| ⭐ Markov Chain Random Walk | Build a transition matrix and simulate random walks. Path preview, visit statistics, CSV/JSON export. Private, client-side. | Science & Engineering | Launch |
| ⭐ Escape Velocity Calculator | Compute escape velocity at any altitude and see circular speed (v_circ) with the √2 relationship. Supports Earth, Moon, Mars, or custom body. Private, client-side. | Science & Engineering | Launch |
| ⭐ Blackbody Radiation Calculator | Compute peak wavelength via Wien’s law and radiated power via Stefan–Boltzmann; optional emissivity & area; client-side and private. | Science & Engineering | Launch |
| ⭐ COSMOTOOLS — Modern Cosmology Calculator | Luminosity, comoving & angular distances, lookback time, age, q0 & Ωk with adjustable H0, ΩM, ΩΛ. Private, client-side. | Science & Engineering | Launch |
| ⭐ Compound Interest Calculator | Project your financial growth with contributions and inflation adjustment. | Calculators | Launch |
| ⭐ Compound Interest Table Generator | Generate tables across rates (0.25%–100%) with custom step, EAR/APR conversion, CSV export, and an interactive graph. | Calculators | Launch |
| ⭐ Salary to Hourly Converter | Convert annual salaries to hourly wages and vice versa, with after-tax estimation. | Calculators | Launch |
| ⭐ Hourly → Annual Salary Calculator | Convert hourly wages into weekly, monthly, and annual salaries with optional after-tax estimate. | Calculators | Launch |
| ⭐ Net Income Calculator | Compute Net Income and NOPAT from EBIT/EBT or a full operating layout; shows EBITDA, EBT, taxes, and margins — 100% client-side. | Calculators | Launch |
| ⭐ EBIT & EBITDA Calculator | Calculate EBITDA and EBIT from revenue/costs or direct inputs. Includes D&A, other operating, and profit margins. Private, client-side. | Financial Calculators | Launch |
| ⭐ Savings Goal / Sinking Fund | Set a target and plan by date or monthly budget — includes progress bar, live chart, and CSV schedule. | Calculators | Launch |
| ⭐ Savings vs. Investing Comparison | Side-by-side cash vs. investing with breakeven timing, “today’s money,” optional uncertainty band, and downloadable CSV. Private, client-side. | Calculators | Launch |
| ⭐ Inflation-Adjusted Return (Real Return) Calculator | Real return from nominal & inflation (Fisher), real CAGR from CPI, plus required nominal for a target real. Private, client-side. | Calculators | Launch |
| ⭐ Retirement Withdrawal / 4% Rule Simulator | Classic 4% rule with inflation indexing, flat £ withdrawals, or % of portfolio. Monthly compounding, COLA, live chart, and depletion check. Private, client-side. | Calculators | Launch |
| ⭐ Rebalancing Impact Calculator | See how periodic or threshold rebalancing compares to Buy & Hold—CAGR, volatility, drawdowns, turnover, and trading costs. Private, client-side. | Calculators | Launch |
| ⭐ Investment Goal Tracker | Plan an investment goal by date or budget with return, fees, inflation, and optional volatility. Live chart, success probability, CSV. Private, client-side. | Financial Calculators | Launch |
| ⭐ Dividend Reinvestment (DRIP) Calculator | Simulate dividend reinvestment with yield or DPS, dividend & price growth, tax rate, frequency, and monthly contributions. Fractional shares, live chart, CSV. Private, client-side. | Financial Calculators | Launch |
| ⭐ Time-Weighted Return (TWR) Calculator | Compute TWR by linking subperiod returns or via Modified Dietz when flows occur within periods. Growth chart, CAGR, CSV. Private, client-side. | Financial Calculators | Launch |
| 💼 Portfolio Return (Weighted Average ROI) Calculator | Compute per-holding ROI plus invested-weighted and value-weighted portfolio returns. Add fees & income, optional date range for CAGR. Private, client-side. | Financial Calculators | Launch |
| ⭐ Budget Planner — 50/30/20 Rule | Build a monthly budget with Needs/Wants/Saving targets, live totals, progress bars, and a donut chart. Private, client-side. | Financial Calculators | Launch |
| ⭐ Emergency Fund Calculator | Estimate your target emergency fund from essential expenses, see current coverage and time-to-goal, with a projection chart. Private, client-side. | Financial Calculators | Launch |
| ⭐ Retirement Planner | Plan for retirement with sliders for savings, age, returns, and inflation — includes live growth chart. | Calculators | Launch |
| ⭐ FIRE Calculator | Calculate your FI number and projected date using SWR, contributions, returns, and inflation—complete with a live growth chart. Private, client-side. | Financial Calculators | Launch |
| ⭐ Salary to Hourly Converter | Convert annual salaries to hourly wages and vice versa, with after-tax estimation. | Calculators | Launch |
| ⭐ Inflation Calculator | Adjust money across years using CPI, compute Fisher inflation and forward rates — all client-side. | Calculators | Launch |
| ⭐ PPP Calculator — Purchasing Power Parity | Convert amounts with PPP conversion factors or CPI + FX; privacy-first, 100% client-side. | Financial Calculators | Launch |
| 💱 Interest Rate Parity Calculator | Price FX forwards with covered IRP, solve implied rates from spot/forward, or estimate expected spot via UIP. Private, client-side. | Financial Calculators | Launch |
| 📈 Real GDP Growth Adjustment Calculator | Convert nominal GDP growth to real using inflation (Fisher), compute real growth from levels + deflators, and chain multi-period real growth. Private, client-side. | Financial Calculators | Launch |
| 💷 Inflation Impact on Salary | Compute real raises vs inflation, break-even raises, CPI-based adjustments between dates, and chain multi-year purchasing power. Private, client-side. | Financial Calculators | Launch |
| 🌍 Exchange Rate Impact on Investments | Unhedged vs hedged returns, FX decomposition, scenarios, and break-even FX—private, client-side. | Financial Calculators | Launch |
| ⭐ Cash Conversion Cycle (CCC) Calculator | Compute DIO, DSO, DPO, and overall CCC days. Includes turnovers, date or length mode. 100% client-side. | Financial Calculators | Launch |
| ⭐ Bond Calculator v1.1 | A simple financial tool to calculate a bond's price, yield, coupon, or maturity. | Calculators | Launch |
| ⭐ Stock Return Calculator | CAGR and total return with dividends; DRIP option, dividend tax, equity curve, and cash-flow CSV. Private, client-side. | Financial Calculators | Launch |
| ⭐ Temperature Converter | Convert between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur. | Calculators | Launch |
| ⭐ 2D Distance Calculator | Calculate the distance between two points (x1, y1) and (x2, y2) on a 2D plane. | Calculators | Launch |
| ⭐ 3D Distance Calculator | Calculate the distance between two points (x1, y1, z1) and (x2, y2, z2). | Calculators | Launch |
| ⭐ Midpoint Calculator (2D & 3D) | Compute the midpoint between two points in 2D or 3D with an isometric preview. Private, client-side. | Geometry | Launch |
| ⭐ Line Intersection Calculator | Solve for the intersection of two linear equations (Ax+By=C or y=mx+b). Flags parallel or coincident lines. Private, client-side. | Geometry | Launch |
| ⭐ Vector Projection / Dot & Cross Product | Compute dot, cross (3D), projection of a onto b, angle, magnitudes, and parallel/perpendicular components. 2D & 3D. Private, client-side. | Calculators | Launch |
| ⭐ Coordinate Transformations (2D) | Translate, rotate (about origin or a point), reflect (axes, y=x, y=−x, angle), and scale (uniform/non-uniform) with live preview. Private, client-side. | Calculators | Launch |
| ⭐ Slope Calculator | Compute slope m, angle, and line equations (y=mx+b, point–slope, Ax+By=C) between two points. Handles vertical lines. Private, client-side. | Geometry | Launch |
| ⭐ Vector Component Resolver (2D/3D) | Compute x/y(/z) components, |a|, unit vector, projection of a onto b, and rejection. Supports component or magnitude+angles input. Private, client-side. | Geometry | Launch |
| 📐 Angle Between Two Vectors | 2D & 3D vector angle (deg/rad), cosine similarity, dot product, magnitudes. Private, client-side. | Calculators | Launch |
| ⭐ Rotation Matrix Calculator (2D) | Build the 2×2 rotation matrix R(θ) and rotate points CW/CCW about the origin or any center. Paste a list for batch rotation. Private, client-side. | Calculators | Launch |
| ⭐ Point to Line Distance (2D) | Perpendicular distance from a point to a line in Ax+By+C=0, y=mx+b, or via two points. Private, client-side. | Geometry | Launch |
| ⭐ Point to Plane Distance (3D) | Perpendicular distance from a 3D point to a plane. Supports Ax+By+Cz+D=0, point+normal, or three points; shows foot and signed/unsigned distance. Private, client-side. | Science & Engineering | Launch |
| ⭐ Plane from 3 Points | Compute a plane from three points or point+normal; outputs Ax+By+Cz+D=0, unit-normal form, and point–normal form. Private, client-side. | Science & Engineering | Launch |
| ⭐ Golden Ratio Calculator | Compute golden sections a, b, and L using φ with a live golden-rectangle preview. Private, client-side. | Geometry | Launch |
| ⭐ Tire Size Calculator | Compare two tire sizes by sidewall, diameter, circumference, revs per mile/km, ride height, and speedometer error. | Calculators | Launch |
| ⭐ IP Subnet Calculator | Enter IPv4 or IPv6 CIDR to instantly see network address, range, usable hosts, and total addresses — all calculated client-side. | Calculators | Launch |
| ⭐ Ohm’s Law Calculator | Enter any two values (Voltage, Current, Resistance, Power) to instantly calculate the other two — with unit scaling and step-by-step formulas. 100% client-side. | Science & Engineering | Launch |
| ⭐ AC Power Calculator | Calculate real (P), apparent (S), and reactive (Q) power from voltage, current, and power factor or angle — supports single-phase and three-phase. 100% client-side. | Science & Engineering | Launch |
| ⭐ DC Power Calculator | Compute direct current power with P = V × I — enter any two values (Voltage, Current, Resistance, Power) to instantly find the others. 100% client-side. | Science & Engineering | Launch |
| ⭐ dB / dBm / Watt Converter | Convert between dB, dBm, dBW, and Watts — with optional Vrms/Vpp/Irms from a chosen impedance (e.g., 50 Ω). Enter one value, get the rest. 100% client-side. | Science & Engineering | Launch |
| ⭐ Wavelength ↔ Frequency Calculator | Convert between wavelength (λ) and frequency (f) using λ = c/(n·f) with medium presets (vacuum, air, water, glass) or custom refractive index. Also shows period, wavenumber, and photon energy. 100% client-side. | Science & Engineering | Launch |
| ⭐ Voltage Divider Calculator | Enter any three of Vin, Vout, R1, and R2 to solve the fourth. Includes optional load (RL) simulation, divider current, and resistor power — 100% client-side. | Science & Engineering | Launch |
| ⭐ UPS Runtime & Sizing Calculator | Estimate UPS runtime from load and battery specs, or size a UPS for your equipment — includes VA ↔ W conversion and efficiency. 100% client-side. | Science & Engineering | Launch |
| ⭐ RAID Calculator | Estimate usable capacity, redundancy overhead, efficiency, and fault tolerance for RAID 0, 1, 5, 6, 10, 50 & 60 — 100% client-side. | Science & Engineering | Launch |
| ⭐ Paint, Flooring & Tile Coverage Calculator | Calculate paint litres and tins, flooring area and packs, plus tile counts and boxes. Multiple rooms, coats & waste. Private, client-side. | Calculators | Launch |
| ⭐ Packing Volume Calculator | Estimate boxes for moving & shipping from item dimensions and quantities. Packing efficiency, fragile padding, weights, and printable summary. Private, client-side. | Calculators | Launch |
| ⭐ Fabric Yardage Calculator | Estimate yardage/metreage with fabric width, seam/hem allowances, nap, vertical repeat, shrinkage, and store rounding. Private, client-side. | Calculators | Launch |
| ⭐ Concrete Yardage Calculator | Slabs, footings, sonotubes/post holes. Imperial/metric, waste %, and bag counts. Private, client-side. | Calculators | Launch |
| ⭐ HVAC BTU Calculator | Estimate room cooling & heating loads, convert to AC tons, and apply sun/insulation/occupancy adjustments. Private, client-side. | Calculators | Launch |
| ⭐ Acoustic Impedance Calculator | z=ρc (Rayl), tube impedance Zc=ρc/S, wavelength, and interface reflection/transmission at normal incidence. Client-side. | Science & Engineering | Launch |
| ⭐ Air — Speed of Sound vs. Temperature | Compute speed of sound from temperature with optional RH & pressure. Linear approximation + moist-air model. Client-side. | Science & Engineering | Launch |
| ⭐ Gases – Speed of Sound | Quick reference: sound speed in gases with search, unit switching, and √T temperature normalization. Private, client-side. | Science & Engineering | Launch |
| ⭐ Fans — Noise Power Generation | Empirical overall sound power level from S, Q, p. SI & Imperial inputs. Client-side. | Science & Engineering | Launch |
| ⭐ Floor Vibrations — Resonance Check | Compute first-mode frequency for joist floors or slabs and check resonance risk vs. human activity & machinery. Private, client-side. | Science & Engineering | Launch |
| ⭐ Random Number Generator | Generate a random number within a custom range and with a specific number of decimal points. | Random Generators | Launch |
| ⭐ Number Set Generator | Generate integer or decimal sets — unique or with repeats, optional step/grid, sorting, and export. | Random Generators | Launch |
| ⭐ Random Choice Generator | Randomly pick a choice from a list of options. | Random Generators | Launch |
| ⭐ Random letter Generator | Generate a single random letter from the alphabet. | Random Generators | Launch |
| ⭐ Random date Generator | Generate one or more random dates within a specified range. | Random Generators | Launch |
| ⭐ Random IP Address Generator | Generate random IPv4 addresses with options to exclude private and broadcast ranges. | Random Generators | Launch |
| ⭐ Random MAC Address Generator | Generate random MAC (EUI-48) addresses with format & case options, unicast/multicast and U/L bit control, plus optional vendor OUI seeding. | Random Generators | Launch |
| ⭐ List Randomizer | Shuffle a list of items, names, or any text into a random order. | Random Generators | Launch |
| ⭐ Strong Password Generator | Generate a secure, random password with customizable length and character sets. | Random Generators | Launch |
| 🎲 UUID v1 Generator | Generate time-based UUID v1 (RFC 4122) with clock sequence and node. Batch 1–200, multiple formats, copy/download. Private, client-side. | Random Generators | Launch |
| 🎲 UUID v3 Generator | Create deterministic UUID v3 (MD5) from a namespace and name. Built-in DNS/URL/OID/X.500 or custom, batch 1–200, multiple formats. Private, client-side. | Random Generators | Launch |
| ⭐ UUID v4 Generator | Generate one or many RFC 4122 compliant UUIDv4 identifiers with color-coded parts. | Random Generators | Launch |
| 🎲 UUID v5 Generator | Create deterministic UUID v5 (SHA-1) from a namespace and name. Built-in DNS/URL/OID/X.500 or custom, batch 1–200, multiple formats. Private, client-side. | Random Generators | Launch |
| ⭐ Dice Roller | Rolls a customizable number of d6 dice with a visual display and total sum. | Random Generators | Launch |
| ⭐ Coin Flipper | A simple tool to flip a coin for a heads or tails decision. | Random Generators | Launch |
| ⭐ Bingo Card Generator | Create and print unique, random 5x5 bingo cards with a free space. | Random Generators | Launch |
| 🧩 Printable Sudoku Generator | Generate printable 9×9 Sudoku puzzles (Easy/Medium/Hard). Save as PNG/PDF or print — fully client-side. | Random Generators | Launch |
| 🌀 Random Maze Generator | Generate printable mazes with custom size & cell width, entrance/exit options, solution overlay, and braid (loops). Save as PNG/PDF or print — fully client-side. | Random Generators | Launch |
| ✨ Kaleidoscope Pattern | Soothing, seedable kaleidoscope with gentle rotation. Choose slices, palette, speed & breathing; switch to Draw mode for mirrored strokes with per-stroke colours. Mobile-friendly and 100% client-side. | Random Generators | Launch |
| 🎡 Spin the Wheel — Random Picker | Paste options and spin to pick a fair random winner. Private, client-side; optional no-repeat draws and copyable history. | Random Generators | Launch |
| ⭐ Random Astronomy Sky Map Generator | Generate a seeded star chart with adjustable star count, brightness curve, optional RA/Dec grid, and PNG export. Private, client-side. | Science & Engineering | Launch |
| ⭐ Random Color Palette Generator | Generate harmonizing color palettes for your designs and lock in colors you like. | Random Generators | Launch |
| 🎮 Tic Tac Toe | Classic 3×3 Tic Tac Toe game — play vs friend or computer (Easy, Normal, Unbeatable), choose X/O, track scores. | Games | Launch |
| 🧊 3D Tic Tac Toe | Three stacked 3×3 layers vs computer: clickable isometric board, smart blocking AI, win-line highlights, and mobile-friendly controls. Related: Classic Tic Tac Toe. | Games | Launch |
| 🎲 2048 Game | Play the classic 4×4 2048 puzzle — slide tiles, merge numbers, use Undo, and aim for 2048. Smooth, mobile-friendly, ad-light. | Games | Launch |
| 🧩 Sudoku | Play Sudoku — Easy/Medium/Hard with notes, hints, undo, timer, and error highlighting. Mobile-first and privacy-friendly. | Games | Launch |
| 🧠 Mental Math Trainer | Practice percentages, fractions, and squares — play Practice or 60/120s speed rounds with gentle feedback, skip, and local bests. Keyboard-friendly and private. | Games | Launch |
| 🍕 Fraction Pizza | Visualize fractions—choose slices, click to fill, and see fraction/decimal/percent update instantly. Kid-friendly, Challenge mode, privacy-first. | Games | Launch |
| ⌨️ Typing Test | 1-minute typing test with live WPM & accuracy graph, gentle feedback, restart, and a printable certificate. Privacy-first, runs client-side. | Games | Launch |
| 🔎 Word Search | Play or build custom word searches — your word list, grid 8–20, diagonals/backwards options, highlights, and printable PDF/PNG (Classroom pack). Privacy-first, all client-side. | Games | Launch |
| 💣 Minesweeper | Classic Minesweeper with a gentle layout, Flag Mode for touch, right-click flags on desktop, timer, remaining mines, and first-click safety. Runs fully client-side for privacy. | Games | Launch |
| 😀 Emoji Catcher | Gentle typing game for kids: type the word on each falling emoji to catch it. One emoji at a time, slower pace for longer words, lives, and scoring by word length. Fully client-side and private. | Games | Launch |
| 🎯 Pachinko Probability (Galton Board) | Interactive Pachinko/Galton board: drop balls through pegs to see a live distribution. Adjustable rows, bias (p), speed, and spawn rate; pseudo-physics arcs with histogram + binomial overlay, mean/SD stats. 100% client-side. | Games | Launch |
| 🧩 Towers of Hanoi | Calm, privacy-first Hanoi puzzle: manual tap/tap moves or auto-solver. Adjustable disks (3–8), speed control, move counter & optimal target (2^n−1), keyboard & screen-reader friendly. 100% client-side. | Games | Launch |
| 🌀 Maze (Playable) | Calm, privacy-first maze game: swipe or use the D-pad/arrow keys. Seeded generator, sizes (15×15–31×31), timer & steps, crumb trail, and brief hint overlay. Keyboard & screen-reader friendly. 100% client-side. | Games | Launch |
| 🧠 Memory Match — Animal Emoji | Flip cards to match pairs. 4×4–6×6 boards, timer, moves, star rating, and local best times. Private, client-side. | Games | Launch |
| ⭐ Little Star Glider | Tap to nudge a star through soft cloud gaps. Simple, cozy arcade with score & best. Private, client-side. | Games | Launch |
| ⭐ Carbon Footprint Calculator | Estimate a personal annual CO₂e footprint from home energy, travel, diet, and spending. Gentle defaults, fully editable factors. Private, client-side. | Environment Tools | Launch |
| ⭐ Flight Emissions Calculator | CO₂ per passenger by distance, seat class, and legs — with passengers, round-trip option, aircraft presets, and RFI toggle for contrails. Private, client-side. | Environment Tools | Launch |
| 🌞 Solar Energy Calculator | Estimate daily kWh and savings from location, tilt, azimuth, and array size (area & efficiency or panels & wattage). Private, client-side. | Environment Tools | Launch |
| ⭐ Commute Emissions Comparison | Compare commute CO₂ across car, bike, bus, and train with editable factors (carpool size, fuel/kWh, grid intensity). Private, client-side. | Environment Tools | Launch |
| ⭐ Carbon Offset Estimator | Estimate trees or renewable kWh needed to offset CO₂. Editable tree growth, survival/buffer, and grid intensity. Private, client-side. | Environment Tools | Launch |
| ⭐ Home Energy Usage Calculator | Add appliances (or presets) to estimate annual kWh, cost, and CO₂. Includes standby, cycles, heat pump COP. Private, client-side. | Environment Tools | Launch |
| ⭐ Electricity vs. Gas Heating | Compare heat pump, electric resistance, and gas boiler on efficiency, energy in, cost, and CO₂. Adjustable COP, prices, and carbon factors. Private, client-side. | Environment Tools | Launch |
| ⭐ EV vs. Gas Car CO₂ Calculator | Compare per-km and lifetime emissions, see break-even distance, and adjust grid/fuel/battery factors. Private, client-side. | Environment Tools | Launch |
| 🌍 Reusable Cup Impact Calculator | Estimate cups avoided and CO₂ saved per year from reusable cups vs single-use. Friendly, editable, client-side. | Environment Tools | Launch |
| 🌬️ Wind Turbine Output Calculator | Calculate turbine power from wind speed & blade size; estimate daily and annual energy. Editable Cp, efficiency, air density, and cut-in/out. Private, client-side. | Environment Tools | Launch |
| 🌊 Ocean Plastic Decomposition Timer | Visualize estimated fragmentation/decomposition times for common plastics across marine environments, with a simple time-lapse. Private, client-side. | Environment Tools | Launch |
| 🔋 Battery Storage Sizing Tool | Estimate needed battery storage for solar: usable & nameplate kWh, autonomy days, module count, and inverter/DC current checks. Private, client-side. | Environment Tools | Launch |
| ⭐ Reforestation Impact Estimator | Friendly estimator of reforestation CO₂ over time. Edit growth, survival, and buffer. Private, client-side. | Environment Tools | Launch |
| ⭐ Water Footprint Calculator | Estimate daily or annual water use across showers, laundry, taps/toilets, dishwasher, outdoor watering, and diet. Private, client-side. | Environment Tools | Launch |
| ⭐ Greywater Reuse Estimator | Estimate potential greywater capture and reuse to toilets/irrigation, with water, sewer, CO₂, and payback savings. Private, client-side. | Environment Tools | Launch |
| ⭐ Plastic Footprint Calculator | Estimate bottles, bags, takeaway and packaging per year — pieces, mass, and optional CO₂e. Private, client-side. | Environment Tools | Launch |
| ⭐ Paper vs. Digital Impact Calculator | Estimate trees, water, and energy saved when documents move from paper to digital. Transparent, editable, client-side. | Environment Tools | Launch |
| ⭐ Shower Water & Energy Calculator | Estimate water use, heating energy (kWh), cost, and CO₂ from flow, time, and temperatures. Private, client-side. | Environment Tools | Launch |
| ⭐ Waste Reduction Impact | Estimate CO₂e saved by recycling vs. landfill/incineration. Fully editable factors; private, client-side. | Environment Tools | Launch |
| ⭐ Solar Payback Calculator | Estimate payback time, cash flow, NPV & IRR from cost, incentives, annual kWh, self-consumption, and tariffs. Private, client-side. | Environment Tools | Launch |
| ⭐ LED vs. Incandescent Savings | Annual kWh & cost savings from LEDs vs incandescents, with optional CO₂ and payback. Private, client-side. | Environment Tools | Launch |
| ⭐ Rainwater Harvesting Calculator | Estimate rooftop rain capture with annual/monthly rainfall, runoff & filter efficiency, first-flush, and optional tank capacity. Private, client-side. | Environment Tools | Launch |
| ⭐ Urban Heat Reduction Calculator | Estimate near-surface air cooling from canopy, shade, green roofs, and cool surfaces. Transparent, editable assumptions. Private, client-side. | Environment Tools | Launch |
| ⭐ Sound Travel Time Calculator | Thunder delay & shout echo calculator with temperature-aware speed of sound. Distance ⇄ time, echo mode. Private, client-side. | Science & Engineering | Launch |
| ⭐ Light Travel Distance | How far does light go while you blink? Enter microseconds or milliseconds to see distances in meters, km, miles, Earth–Moon fraction, AU fraction, and times around Earth. | Science & Engineering | Launch |
| ⭐ How Many Helium Balloons to Lift You? | Estimate how many helium balloons could pretend-lift a chosen weight. Includes 9″/12″/24″ presets, custom size, kg/lb, and practical margin. Private, client-side. | Fun Calculators | Launch |
| ⭐ How Many Earths Fit in the Sun? | Compare any planet to any other by volume. Shows ideal vs sphere-packing counts and a friendly visual. Private, client-side. | Fun Calculators | Launch |
| ⭐ Cloud Storage in Floppy Disks Converter | Convert modern sizes into counts of retro media (floppies, CDs, DVDs, Blu-ray, Zip/Jaz, VHS). Decimal/binary units, VHS bitrate/length, private & client-side. | Fun Calculators | Launch |
| 🧠 How Many Tabs Can Your Brain Handle? | Estimate comfy vs. stretch tab counts from working-memory capacity, task complexity, and distractions. Private, client-side. | Calculators | Launch |
| ☕😴 Coffee-to-Sleep Tradeoff | Estimate bedtime delay and sleep loss from caffeine timing and dose with a simple half-life model. Private, client-side. | Health & Fitness Calculators | Launch |
| ⌨️ Keyboard Typing Distance | Turn word counts into meters and kilometers of finger travel, with configurable typing assumptions. Private, client-side. | Fun Calculators | Launch |
| 🧻 Toilet Paper Roll Length Converter | Turn toilet paper rolls into meters, kilometers, and fun comparisons (Eiffel Towers, football pitches, blue whales). Private, client-side. | Fun Calculators | Launch |
| 🐌 Snail Mail Speed Calculator | Compare a snail’s travel time (speed & duty cycle) with postal delivery times. Private, client-side. | Fun Calculators | Launch |
| 🪐 How Much Would You Weigh on Every Planet? | Enter Earth weight (kg/lb/N) or mass (kg) and see your weight across the Solar System using real planetary gravity constants. Private, client-side. | Fun Calculators | Launch |
| 📄 Data → Paper: How Many Pages? | Convert a text file size into printed pages with encoding & layout presets. Outputs pages, sheets, reams, paper weight, and stack height. Private, client-side. | Fun Calculators | Launch |
| 🔊 How Loud Is Too Loud? | dB ↔ intensity, pressure, source acoustic power from distance/directivity, and energy over time. Private, client-side. | Fun Calculators | Launch |
| ⭐ Love Calculator | Check playful name chemistry and an optional birthday rhythm boost. Private, client-side. | Games | Launch |
| 🐶 Dog Years to Human Years (Breed-Aware) | Breed/size-aware converter with Classic + DNA curves, months input, and a friendly visual. Private, client-side. | Fun Calculators | Launch |
| 😴 Perfect Nap Length Calculator | Sleep cycle optimizer: power naps (10–20 min) or full cycles (~90–110 min), start/wake planning, latency & chronotype tweaks. Private, client-side. | Fun Calculators | Launch |
| ⭐ Cells You’ve Replaced — “Every 7 Years” Myth Calculator | Explore tissue-by-tissue turnover with plain-English sources. Kid-friendly, private, 100% client-side. | Science & Engineering | Launch |
| ⭐ Email Carbon Footprint | Estimate the CO₂ footprint of emails and attachments with simple & advanced modes and friendly comparisons. Private, client-side. | Fun Calculators | Launch |
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