Reaction Time: Reflexes & Duel

Six ways to test your reflexes

• Classic: the screen turns from red to green. Tap as fast as you can.
• Start lights: five red lights come on one by one. Tap the moment they all go out.
• Go or no go: tap on green, hold back on blue.
• Sound: tap when you hear the beep.
• Vibration: tap when the phone buzzes in your hand.
• 2 player duel: one phone, half the screen each, first to 3 points wins.

How a tap is timed

The color changes in a single frame. There's no fade and no countdown. The clock starts at the screen refresh where the green can first appear, and your tap is timed with the timestamp the touchscreen records when your finger lands.

Taps under 100 ms count as too early, because nobody reacts that fast. Every phone adds a few milliseconds in its screen and touch hardware. That delay only ever makes times slower, and it's the same on every try, so your progress on one phone stays fair to compare.

Try it in your browser

There's a reaction time test on this site that works the same way as the classic mode, as far as a browser allows. It's a quick way to see where you stand before you install anything.

Questions