Reaction Time Test
Click as soon as the box turns green. Clicking too early restarts the round.
Last updated
—Last time (ms)
—Best time (ms)
—Average (last 5)
Click to start
About this game
Click the instant the box turns green — clicking too early during the red phase restarts the round. Your best time and recent average are saved on this device. Typical human reaction time is roughly 200–300ms; much faster usually means you anticipated the change rather than reacted to it.