HTML5 Reaction Time Test


Click/touch the green light or push any button when the light turns green to measure your reaction time. The lights will change at random intervals.


This page was developed for demonstration purposes using HTML5 syntax. There are no static images or server roundtrips contained within this page. This page is written in Javascript and should not be used as a scientific instrument unless your browser's javascript implementation has been certified for timing accuracy.
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Results (in milliseconds)
Attempt 1 Attempt 2 Attempt 3 Average