Just the tool you need.
No sign-up, no install. Open it and it works. Your files never leave your device.
For teachers
Test and worksheet makers, classroom screens, attendance and seating — ready to use in class
- Test & Quiz Maker (Printable)
- Math Worksheet Generator
- Random Seating Chart
- Classroom Timer
- Class Roster & Checklist Maker
- Quiz Show Board Maker
For students
Step-by-step equation and calculus solvers, unit conversion, grade calculators, study timers
- Quadratic Formula Calculator
- Derivative Calculator
- Unit Converter — Length, Weight & Temp
- GPA & Grade Scale Converter
- Scientific Calculator
- Flashcards
Languages
A sentence a day, a situation a day, today's words, flash drills — and a side-by-side translation checker
- Sentence of the day
- Situation of the day
- Words of the day
- Flash drill
- Translation checker
- Correction requests
Engineering
Electronics and mechanical calculators, quality control, statistics, developer tools, device checks — and an equipment UPH simulator
- ProcessLab · equipment UPH simulator
- ProcessStat · statistics workshop
- DOE design-of-experiments builder
- Getting started · examples and tutorials
- Resistor Color Code Calculator
- Ohm's Law Calculator
- Control Chart Maker
- Statistics Calculator
- JSON Formatter & Validator
- Unit Converter — Length, Weight & Temp
Mechanical design
Fits and tolerances, beam deflection, sections and shaft strength, materials, threads, bolt torque and springs, motors, pneumatics, linear guides and GD&T for mechanical design
- Mellow Drafting · Photos to dimensioned drawings (experimental)
- Limits & Fits Calculator (ISO 286)
- Beam Deflection Calculator
- Bolt Torque Calculator
- Thread Size Chart — pitch, pitch diameter, tap drill
- Bearing Size Chart
- Motor Sizing Calculator (Torque & Inertia)
Work & documents
PDF, image and text tools, business-day and fee calculators, charts and forms — the everyday office set
- Photo Scanner (experimental)
- Merge & Split PDF — extract pages online
- Free QR Code Generator — Wi-Fi & vCard
- Image Compressor — JPG, PNG and WebP
- Business Days Calculator
- Invoice & Quote Generator
- Word Counter & Character Count Tool
Music
A music studio to play and record, a rhythm game, metronome, tuner, chord and scale finders and a drum pattern sequencer
- Music studio (experimental)
- Audio Recorder
- Sheet Music Scanner
- Metronome
- Instrument Tuner
- Tap Tempo
- Chord Finder
- Scale Finder
Design
Colour, palettes and contrast checks, CSS, layout and print sizes, and patterns from photos for cross-stitch, diamond painting, paint by number and knitting
- Mellow Studio · Design studio (experimental)
- Space scan (experimental)
- Object scan (experimental)
- Color Palette & Gradient Generator
- Color Contrast Checker (WCAG)
- Cross Stitch Pattern Maker from Photo
- Paint by Number Pattern Maker
- Pixel Art Maker
- Image Color Picker & Palette
Everyday life
Cooking, parenting, travel, cars and home, loans and savings, date math — calculators for daily life
- Date Calculator — Days Between Dates
- Loan Calculator — payment and interest
- Mortgage Calculator
- BMI Calculator with BMR & TDEE
- Fuel Cost Calculator
- Recipe Scaler
Measure
Turn the screen into a ruler, protractor or level; calibrate with a card or coin for true size
- Online Ruler — actual size cm and inch
- Online Protractor
- Actual Size Preview
- Bubble Level
- Ring Size Finder
- Photo & Paper Sizes at Real Size
Hobbies
Cross-stitch, diamond painting and knitting charts, bead and bracelet patterns, copywork sheets — plus tools for coffee, baking and music
- Cross Stitch Pattern Maker from Photo
- Knitting Colourwork Chart Maker
- Copywork Sheets (handwriting practice)
- Perler Bead Pattern Maker (Hama, Lego Mosaic)
- Diamond Painting Pattern Maker
- Paint by Number Pattern Maker
Puzzle solvers
Stuck on a puzzle? Step-by-step answers for the Soma cube, Rubik's cube, sudoku, tangram, pentominoes and more
- Snake Cube Solver (3D)
- Kakuro Solver
- Killer Sudoku Solver
Fun
Classic games, personality quizzes, random picks and team splits, fortunes
- Sudoku
- Minesweeper
- Wheel Spinner
- 16 Personality Types Test
- Random Team Generator
- 2048