Reaction Time Test
Wait for the box to turn green, then click as fast as you can.
Last: — ms
Best: — ms
Avg: — ms
Click to begin
Don't click during red — that's a false start.
About this tool
Click "Start". The box will turn red, then after a random delay (1–4 seconds) it'll turn green. Click again the instant you see green. Tracks your best reaction over multiple tries. Click too early and you have to start over.