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Reflex
How fast are your reflexes? Tap when the screen turns green.
Reflex is a simple reaction-speed test: wait for the screen to turn green, then tap as fast as you can to measure your reaction time in milliseconds. Compare attempts and try to beat your best.
- Measure reaction time in milliseconds
- Instant results after every tap
- Beat your personal best
- Works on mobile and desktop — free
Frequently asked questions
What is a good reaction time?
Most people average around 200–250 milliseconds; under 200ms is fast.
Is Reflex free?
Yes, it is completely free with no login.
Does it work on a phone?
Yes. Tap the screen when it turns green on any device.