Reaction Time Test
Click when the screen turns green and measure your reflexes in milliseconds — with your best and average score.
Nothing is uploaded. The test runs entirely on your device.
How it works
Click the box to start
Wait for it to turn green
Click as fast as you can
About this tool
This reaction time test measures how quickly you respond to a visual cue. Click to start, wait for the box to turn green — after an unpredictable delay so you can't anticipate it — then click as fast as you can. Your time in milliseconds is shown, along with your best and average across attempts.
A typical result is 200–300 ms. Everything runs in your browser with nothing uploaded. Want to test your fingers instead of your reflexes? Try the typing speed test.
Frequently asked questions
Click the box to start, then wait. After a random delay it turns green — click as fast as you can. The tool measures the milliseconds between the colour change and your click, and tracks your best and average over several tries.
A typical human visual reaction time is around 200–300 milliseconds. Anything under 200 ms is very fast. Gamers and athletes often score at the quicker end.
You clicked before the box turned green. Wait for the colour change — clicking early doesn't count, so you can't cheat the timer.
A little. Screen refresh rate, input lag and mouse or touchscreen latency all add a few milliseconds, so compare scores on the same device.
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