Answer: Click the moment the colour changes to measure your reaction time in milliseconds across five trials with an average score.
Tap when the panel turns green — measure your reflexes in milliseconds
For entertainment and informal self-checks only. Reaction time varies with device latency, tiredness and input method — it is not a medical or cognitive assessment.
Typical human visual reaction time lands between roughly 200 and 300 milliseconds. Practiced players, especially gamers, often score 150-200 ms, and anything consistently under about 150 ms usually means you anticipated the change rather than reacted to it. Use your average over several trials, not your best single click.
Wait for the color to change, then click or tap as fast as you can; the timer measures the gap in milliseconds. The test runs multiple trials and averages them so one lucky or one fumbled click doesn't dominate your score. Everything runs locally in your browser.
Very fast scores usually mean you clicked before the color changed — that trial was anticipated, not reacted. Slow scores come from distraction, hesitation, or input lag from the device. Discard outliers and compare your median across a few full runs.
Yes. Display refresh rate, mouse versus trackpad, and browser overhead can all shift results by 10-30 ms or more. Compare scores only against yourself on the same device — trends over time are more meaningful than the absolute number.
This test measures visual reaction time: the delay between the panel turning green and your tap registering. A random 1.5–4 second wait stops you from rhythm-guessing the switch, and false starts (tapping while it is still red) are detected and excluded. Everything runs locally in your browser with JavaScript timing — no data leaves your device.
Average human visual reaction time is around 250 ms. Trained gamers and athletes often land between 150–220 ms, while anything under 200 ms is genuinely fast. Touchscreens add 20–70 ms of input latency compared to a mouse, so compare like-for-like devices when bragging to friends.
Use your dominant hand, keep the device flat on a desk, and stay relaxed — tension slows you down. Run the 5-attempt challenge and judge yourself on the average rather than a single lucky tap. If you keep seeing "Too soon!", slow down: anticipating the green actually costs more time than reacting calmly.