Reaction time test
Test your reflexes — wait for green, then click as fast as you can. Tracks your best and average in milliseconds.
Typical human reaction time is around 200–300 ms. Everything runs locally.
How to use
Click anywhere in the box to begin. The panel turns red and, after a random delay, switches to green — the instant it does, click as fast as you can. The tool measures the time between the green appearing and your click, in milliseconds.
Click too early, while it's still red, and the attempt resets so you can't cheat by spamming clicks. Each valid attempt is added to a running average of your last five tries, and your single fastest time is saved locally as your best.
It's a simple way to measure visual reaction time and compare it over multiple goes — or to compete with friends on the same device. Everything runs in your browser, so it's instant and private.
Examples
Take five or six goes in a row and try to push your fastest time below 250 ms.
Test your reaction time in the morning and again late at night to see how alertness affects it.
Pass the device back and forth and see who has the quicker average over five attempts.
Frequently asked questions
What's a normal reaction time?
For a simple visual cue like this, most people land between 200 and 300 milliseconds. Athletes and gamers often sit at the faster end of that range.
Why does it reset when I click early?
Clicking before the panel turns green counts as a false start, so the attempt resets. This stops rapid clicking from producing fake fast times.
Does screen and mouse lag affect my score?
Slightly — display refresh rate and input latency add a few milliseconds. The test is best used to compare your own attempts on the same setup.
Is anything uploaded?
No. The test runs entirely in your browser; only your best time is saved locally on your device.
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