Reaction Snap

Five rounds. Wait for the panel to turn green, then tap as fast as you can. We average your five times and show how you compare.

  1. 1 Tap the panel to arm a round
  2. 2 It stays red for a random moment
  3. 3 The instant it turns green, tap

Reaction Snap
0ms
average over 5 rounds

  • —Personal best
  • —Day streak
  • —Your rounds
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About Reaction Snap

Reaction Snap measures how quickly you respond to a visual change — the same simple-reaction-time test used in psychology labs, run five times and averaged so one lucky (or unlucky) tap doesn't decide your score.

  1. Tap the panel to arm a round. It turns red.
  2. After a random delay it flips to green. Tap the moment it does.
  3. Tap too early and the round restarts — no guessing your way to a fast time.
  4. After five clean rounds you get your average and a percentile.
What is a good reaction time?

For a visual cue, most people land somewhere between 200 and 300 milliseconds. Around 250 ms is a typical median. Under 200 ms is genuinely fast; under 150 ms usually means you anticipated rather than reacted.

How is the percentile worked out?

It compares your average against a fixed reference curve for human visual reaction time. It is an approximation for fun, not a clinical measurement — screen refresh rate, input lag and how tired you are all move the number.

Does anything get sent anywhere?

No. Every round is timed in your browser. Your best time and streak are saved to this device's local storage only — no account, no upload.