How to use it
Follow the on-screen instructions several times and compare repeated attempts rather than one score.
Reaction Time Test
Click when the screen changes color and measure your reaction time in milliseconds.
Best time
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Recent average
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Last 0/5
Use mouse, touch, Space or Enter. Display and input latency affect this informal test. The color change has no sound cue.
When signed in, scores from 50–2000ms are saved to the server. Percentiles are hidden if fewer than 20 records are available or the query fails.
TOOL GUIDE
When to use it
Content reviewed · 2026-07-24
Click when the screen changes color and measure your reaction time in milliseconds.
Before you rely on the result
Results can vary with the browser, operating system, display, and input device.
Data handling
Shared rooms, votes, or scores may store the minimum result data needed for the shared feature.
Related tools
A few tools that fit naturally with this task.