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Reaction Time Test
Click when the screen turns green. Measures your reaction time in milliseconds with grade ratings and local best score tracking. Runs in your browser.
100% Private & Secure
This tool runs in your browser.
Your data is never uploaded or stored.
Reaction Time Test
Click Start, then click as fast as you can when the screen turns green.
Best
—
Average
—
Attempts
0
Grade Scale
Amazing
< 180 ms
Great
180–250 ms
Good
250–350 ms
Average
350–500 ms
Slow
> 500 ms
How to use
- 1
Click Start and wait for the screen to turn green.
- 2
Click as fast as you can when it changes.
- 3
See your reaction time and grade.
Why use this tool?
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Fast, instant results — no waiting, no page reloads.
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Clean, focused interface designed for developers.
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100% private — everything runs in your browser, nothing is uploaded to any server.
Frequently Asked Questions
How is reaction time measured?
Using performance.now() for millisecond accuracy.
What happens if I click too early?
It counts as a false start and you can retry.