Reaction Time Test
Test your visual reaction time: wait for the screen to turn green, then click as fast as you can. See your result in milliseconds, plus your best and average across attempts.
A typical human visual reaction time is 200–300 ms. Everything is measured locally with a high-resolution timer; nothing is uploaded.
About This Tool
Reaction time is how quickly your brain and body respond to a stimulus — here, how fast you can click once the screen turns green. It is a simple but revealing measure of alertness that gamers, athletes, and drivers all care about.
How the test works
Click to start, then wait. The screen shows red while a random delay counts down (so you cannot anticipate it). The instant it turns green, click as fast as you can. The tool measures the milliseconds between the color change and your click using a high-resolution timer. Click too early, while it is still red, and the attempt is voided — no cheating by mashing.
What is a good score?
A typical human visual reaction time is 200–300 milliseconds. Under 200 ms is genuinely fast; competitive gamers and athletes can approach 150 ms. The delay comes from the chain of events required: light hits your retina, the signal travels to your visual cortex, your brain decides to act, and the command reaches your finger.
Why your times vary
Reaction time is not a fixed number. It changes with focus, fatigue, caffeine, and how much you are anticipating the signal. That is why the tool tracks your best and average across several attempts — a handful of tries gives a much truer picture than any single click.
Everything is measured locally in your browser.
Frequently Asked Questions
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Last updated: July 29, 2026