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Sound reaction time test

React to a beep the moment you hear it, timed on your device's audio clock, with what your headphones add explained. Free, with no account or uploads.

React the moment you hear the beep

Turn your sound on. The screen does not change: only the beep tells you.

How many tries
51020

Press Space or Enter, click or tap the box. A press before the change is too soon; under 100 ms is a guess.

How it works and help
Everything happens in your browser. Nothing is sent anywhere.

A little help along the way

Follow these steps. Every option is explained underneath. Everything happens in your browser; nothing is sent anywhere.

  1. Choose what to react toA colour change is the usual test. A sound, choosing a side and start lights are the others; targets, clicks a second and the spacebar counter test speed of another kind.
  2. Choose how many triesFive tries give a quick score; ten or twenty a steadier one. Clicks are counted over 1 to 60 seconds, and targets in tens.
  3. Press Start, then waitKeep your finger ready. The change comes after a wait that cannot be guessed. Press Space or Enter, click or tap the box the moment it comes.
  4. Read your resultYour middle try comes first, then the average, the fastest and slowest, every try, and what your setup adds.

Questions people ask

Is reacting to sound quicker than to sight?
Often a little, in lab studies. Here the beep is scheduled on your device's audio clock and placed on the page's clock, so your speakers' own delay is part of your time; wireless headphones can add a lot.
Should I use headphones?
Wired headphones or the device's own speakers are best. Bluetooth headphones delay sound by a tenth of a second or more, which this page cannot see or take away.
Can I take this test with a screen reader?
Yes: the beep is the only change, so the test does not depend on seeing the screen. Press Space or Enter when you hear it.

This page is the Reaction time test, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the Reaction time test's own page.

Read the step-by-step guide

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