Reaction Time Test
Click the box the instant it turns green. 5 rounds — how fast are you?
About the Reaction Time Test
Reaction time is the interval between a stimulus appearing and your response to it. This test measures visual reaction time — how quickly you respond to a colour change on screen. The average human reaction time is around 200–250ms. Under 200ms is considered fast; under 150ms is exceptional.
How to get accurate results
Run 5 attempts and use your average. Avoid clicking before the screen turns green — an early click is recorded as a miss. For best results, use a wired mouse or touchscreen, close other tabs, and test when alert.
Colour guide
Results are colour-coded: green = under 200ms (fast), yellow = 200–300ms (average), red = over 300ms (slow). The red "Too early" flash means you clicked before the green appeared.