Reaction Time Test
Wait for the green screen, then tap as fast as possible. Five attempts give an average and a best time.
Attempts
How the reaction time test works
The test measures simple visual reaction time: the delay between a color change on screen and a tap or key press. Each attempt starts on a red screen and switches to green after a random wait between 1.5 and 5 seconds, so guessing the moment gives no advantage. A tap before the switch counts as too soon, and the attempt starts over. After five attempts the page shows the average and the fastest time.
What counts as a good reaction time
Most adults score between 200 and 300 milliseconds on a test like this one, with a typical result near 250 ms. Trained gamers and sprinters often reach 150 to 200 ms. Scores under 100 ms almost always come from anticipating the color change instead of reacting to the change.
Why results differ between devices
Every measurement includes the delay of the screen, the browser and the input device. A 60 Hz display adds up to 16 ms before the green frame appears, and wireless mice and touch screens add a few more. Comparing scores on the same device gives the fairest result. The Space key works the same as a tap, and the personal best stays in this browser only.