Reaction Time Test
Start a trial, wait for the area to change color, then click. Repeat five times and compare the median.
Test area
Results
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How to use this tool
Start a trial, wait for the area to change color, then click. Repeat five times and compare the median.
Method and units
performance.now() · Δt = t(click) − t(signal) · median(Δt)
What this test can and cannot tell you
Browser intervals are estimates, not certified USB rates, panel specifications or pure human reaction time.
Results reflect events and signals available to your browser. Settings, permissions and device support can affect them; they do not certify that hardware is healthy or faulty.
Input tests run in your browser. Camera and microphone access starts only after you request it.
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