Free · no signup · browser-local
Reaction Time Test
Measure click reaction time after a randomized visual signal.
Click Start, wait for the green signal, then click as quickly as you can. A click before the signal is a false start.
Browser rendering, input devices and display latency affect this informal measurement. It is not a medical test.
Getting started
Start, wait for the green signal and click; early clicks are false starts.
Before you use the result
Hardware and browser latency influence results; this is an informal test.
Frequently asked questions
Measure click reaction time after a randomized visual signal.
How do I use Reaction Time Test?
Start, wait for the green signal and click; early clicks are false starts.
Does this tool upload my data?
Inputs and files are processed in your browser. Page-view analytics do not contain your tool input.
What should I check before using the result?
Hardware and browser latency influence results; this is an informal test.