Playground
Little browser programs: converters, games, instruments, simulators, and things that make cute sounds.
Every toy runs right here in your browser — nothing gets sent anywhere.
Tools & text (11)
Money Desk
Tips, loans, growth, and percentages
OpenColor Lab
Play with colors, palettes, and contrast
OpenText Workshop
A workbench for pushing words around
OpenConverters
Units, bases, Roman numerals, and time zones
OpenCaesar Wheel
Rotate the alphabet, pass the note
OpenRecipe Scaler
Scale ingredients up or down
OpenIngredient Converter
Cups to grams, and back
OpenPassword generator
Random passwords and passphrases
OpenRandom belt
Dice, coins, pickers, and names
OpenLaundry Timer
Wash, dry, fold
OpenTimers
Pomodoro and countdown clocks
OpenGames & puzzles (9)
Slug Derby
The slowest race on earth
OpenSprout
Guess the word, keep the sprout
OpenLights Out
Turn them all off
OpenFifteen Puzzle
The classic sliding-tile headache
OpenWord Search
Find the hidden words
OpenPlinko
The sunflower-seed casino
OpenMinesweeper
Careful where you click!
OpenPairs
Flip two, remember, repeat
OpenMaze Walker
Get in, get out.
Open