Tests & random tools
Test your reaction time, click speed and more right in your browser - plus fair random tools. Every result stays on your device.
Measure yourself: reaction time, click speed, memory span and more run entirely locally in your browser. There is no account and no server collecting your results - best scores, history and streaks live in your browser’s local storage, and you can export or delete them at any time.
Comparison values come exclusively from published studies with a visible source line, never from our own data collection. The random tools draw with the browser’s cryptographic randomness (crypto.getRandomValues) - verifiably fair for classroom draws, stream giveaways and office picks.
Reaction time test
Measure your reaction time in your browser: 5 attempts, your average and a comparison with published study values. All results stay on your device.
Hearing frequency test
Test which pitches you can hear - right in your browser, with capped volume. Not a medical exam, all results stay on your device.
Daily number puzzle
Guess the equation of the day in 6 tries - the same puzzle for everyone, entirely local in your browser. Your streak and stats stay on your device.
Typing speed test
Measure your typing speed (words per minute) and accuracy in your browser - 1 minute, 3 minutes or a fixed word count. All results stay on your device.
Wheel of Fortune
Enter names or options and spin the wheel: a fair, random pick right in your browser - with optional weighting, several saved lists and a share link.
Color vision test
Test your color perception with dot-pattern plates along real confusion lines - freshly generated each run. Not a medical eye exam.
Winner Picker
Paste a list, pick a count, draw winners without replacement - fair via cryptographic randomness, entirely local in your browser.
Team Generator
Paste a list, choose the number of teams, split fairly and randomly - great for class, sports or office events, entirely local.
Dice Roller
Roll virtual dice using classic NdM notation (e.g. 2d6) and see the individual rolls plus the total - fair via crypto randomness, no physical dice.
Coin Flip
One click, one fair coin flip: heads or tails via cryptographic randomness, with a running tally - entirely local in your browser.
Random Number Generator
Enter a from-to range and draw a fair random number - no rounding bias, via cryptographic randomness right in your browser.
CPS test (clicks per second)
Measure your click speed right in your browser: click as fast as you can for 5 seconds. All results stay on your device.
Aim trainer (accuracy test)
Train and measure your aim: 10 targets appear at random, you click them as fast and precisely as possible. Everything stays on your device.
Digit span memory test
Test your digit span: memorize a growing number sequence and type it back. Every correct answer makes the sequence one digit longer.
Sequence memory test
Memorize the lighting pattern and tap it back in the right order. The sequence grows by one tile after every correct round.
Visual memory test
Memorize the briefly highlighted tiles in a 5x5 grid, then tap them back - order does not matter. Each round adds one more tile.