Speed & Perception
REACTION
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REACTION
TIME
TEST
The field is red. The moment it flashes green, tap it. We measure the gap between the flash and your tap, five times, and report your best and average in milliseconds.
How it works
1
Wait on red
Tap too early and the trial resets — no cheating the clock.
2
Tap the instant it turns green
The green appears after a random 1.5–4 second delay so you can't anticipate it.
3
Five valid trials
Your slowest is dropped; best and average are reported.
GET READY
Tap to begin the first trial
Results
YOUR
← All free vision tests
YOUR
REACTION
← All free vision tests
Note
This measures simple visual reaction time — how fast you perceive a change and move. Your screen's refresh rate and input lag add a small fixed delay, so treat the absolute number as ballpark, not clinical. Not a medical or fitness assessment. Compare against your own runs, not other devices.