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Choice reaction time test

An arrow points left or right: press its side as fast as you can, with wrong sides counted and taken again. Free, with no account or uploads.

Press the arrow's side

Use the arrow keys, or tap the arrow's half of the box. A wrong side is counted and taken again.

How many tries
51020

Press the arrow key on the arrow's side, or tap that half of 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

What is a choice reaction time?
The time to react when you must first decide which of two answers is right. An arrow points left or right, and you press the arrow key or tap that half of the box.
Why is my choice reaction slower than my simple one?
Choosing adds a decision before the movement, so choice reactions are usually a good deal slower than simply pressing when something changes.
What happens if I press the wrong side?
The try is taken again and the wrong press is counted in Wrong side, so speed never comes from guessing.

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

Guides

Same tool, other jobs

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