Reaction Time Test — Measure Your Reflexes
Measure your reaction time in milliseconds: wait for red to turn green, then click as fast as you can. Five rounds with per-round results and average. Runs locally — nothing is recorded or uploaded.
🔒 Runs entirely in your browser. Your input and output are never sent to a server or stored — fully private.
💡 Typical human reaction time to a visual stimulus is about 200–300 ms. Display latency and input lag add to your score.
🔒 The test runs entirely in your browser — nothing is recorded or uploaded.
About this tool
The moment the screen turns green, click — that is the whole test. Five rounds are timed and averaged to give a stable measure of your visual reaction time, filtering out the lucky guesses a single attempt allows. Most people land between 200 and 300 milliseconds, with quick gamers pushing into the low 200s. Click too early and the round simply restarts, so anticipating the change will not help. Everything is timed locally in your browser; your results are never uploaded, ranked or shared — they exist only on your screen.
Frequently asked questions
What counts as a good reaction time?
On browser tests like this one, most adults average roughly 250-270 ms, so anything under 250 ms is quick and under 220 ms is genuinely fast. Trained esports players sometimes approach 170-190 ms. Keep in mind the number includes your hardware: laboratory equipment measures pure human reaction closer to 160-190 ms, while a browser test adds display and input latency on top. The fairest comparison is against your own past results on the same setup.
What affects my reaction time?
Biology first: reaction time slows gradually with age, and fatigue, alcohol and low alertness all add milliseconds, while caffeine and a good night's sleep trim them. Hardware matters just as much in a browser test — a 60 Hz monitor, TV-style image processing, a slow mouse and a busy CPU can together add several tens of milliseconds. That is why the same person can score noticeably better on a 144 Hz gaming setup than on an old office PC.
Why five rounds, and is anything stored or uploaded?
A single round is noisy: one lucky, half-anticipated click can come out 80 ms faster than your true speed. Averaging five rounds smooths out both luck and outliers, and clicking before the green appears simply restarts the round instead of rewarding gambling. The whole test is timed locally in your browser using high-resolution timers; your results are never uploaded or stored on a server, and they disappear when you leave the page.