

When the box turns green, tap or click as fast as you can. Do it 5 times and get your average reaction time.
Tip: rest your finger right over the screen or mouse button. Tapping before it turns green doesn't count, so no guessing!
For a simple "tap when it changes" test like this, most people score somewhere around 200 to 300 milliseconds. Under 200 ms is very quick.
Tiredness, focus, caffeine and practice all make a difference. Your device matters too: some phones, screens and wireless mice add a few extra milliseconds of delay.
No. Everything runs in your browser, and nothing is sent anywhere.
Tap to begin
Wait for green, then tap as fast as you can
Send your time to friends and see who has the fastest reflexes.
See how your memory holds up, or take the full 36-question IQ-style test.
Memory test IQ test