How quickly can you react to something you see? The Reaction Time Test measures exactly that — click the red box, wait for it to turn green, and click again as fast as you can.
What counts as a good time?
Average human visual reaction time typically falls around 200-250 milliseconds. Times consistently under 200ms are considered fast, while times over 300-350ms are on the slower end — though reaction time naturally varies with alertness, age, practice, and even what device/input method you’re using.
Why the delay is randomized
Each round waits a random delay (roughly 1.5 to 4 seconds) before turning green. This is intentional: without randomization, you could anticipate the timing and click on a rhythm rather than genuinely reacting to the color change — which would measure your sense of rhythm, not your actual reaction speed.
Clicking too early
If you click before the box turns green, it’s flagged as “too soon” and doesn’t record a time. That click happened before there was anything to react to, so it wouldn’t be a meaningful measurement.
Tracking your progress
The tool keeps a running tally of your last, best, and average reaction times across all your attempts in the session, so you can see whether you’re actually getting faster with practice.
Try it yourself
Head to the Reaction Time Test, click to start, and see how your reflexes measure up.