Reaction Time Test

Measure how fast you react when the screen turns green.

Runs entirely in your browser - nothing is sent to a server.

Related tools

How it works

  1. 1

    Click Start

    Wait for the red box to turn green.

  2. 2

    Click as fast as you can

    Your reaction time in milliseconds appears instantly.

FAQ

What happens if I click too early?
It counts as a false start - click Start again to retry.
What is a good reaction time?
Under 200ms is excellent, 200-300ms is good, 300-450ms is average for most people.