Browse tools by category
160 free tools in 13 categories. Each category page explains what its tools are for and how to choose between them.
- Free Online Calculators
Calculators · 28 tools
Percentages, dates, unit conversions and material estimates — every calculator runs in your browser, with no ads, no sign-up and no data sent anywhere.
- Random Generators
Generators · 4 tools
Generate passwords, usernames and random numbers in your browser. Nothing is transmitted, so a generated password is seen by nobody but you.
- Financial Calculators
Finances · 11 tools
Tax, tips, loan payments, compound interest and budgeting. Your figures stay on your device — no account, no upload, and nothing logged.
- Cooking and Kitchen Tools
Cooking · 6 tools
Save recipes, scale them to any number of servings, plan meals for the week and build a grocery list — all stored in your own browser.
- Books and Reading
Books · 1 tool
Keep a reading library that belongs to you: the books you own, the ones you have read, private notes on each, and no account required to start.
- Health and Fitness Calculators
Health · 12 tools
BMI, exercise calorie estimates and a stopwatch for intervals. Estimates from published formulas, computed in your browser and never uploaded.
- Writing and Text Tools
Writing · 12 tools
Count words, compare two drafts, generate placeholder text, keep a journal or a to-do list — text tools that never send what you write anywhere.
- Developer Tools
Dev · 19 tools
JSON, JWT, regex, hashes, cron, CIDR and timestamps — decoded in your browser, so a token or a payload never reaches anyone else's server.
- Encoders and Decoders
Encoding · 6 tools
Base64, URL escaping, HTML entities and QR codes. Convert text between formats in your browser, with nothing uploaded and nothing stored.
- Design and Colour Tools
Design · 9 tools
Build colour palettes, convert between hex, RGB and HSL, check a palette for colour blindness, and compress or convert images without uploading them.
- Craft and Sewing Calculators
Crafts · 3 tools
Quilt yardage, yarn quantities and evenly distributed stitches — the arithmetic that decides how much material to buy before you start.
- Astronomy and Outdoor Tools
Space · 6 tools
Eclipses, moonrise, tides and launch windows, plus a compass and spirit level that read your device's own sensors. No location is ever uploaded.
- Games and Fun Tools
Fun · 43 tools
Sudoku, Minesweeper, 2048, tier lists, bingo cards and pet age calculators. Every game runs offline, with no account and no leaderboard.