Disclaimer. Browser response times depend on your screen, input device and system load. They are labelled device-dependent and are not a medical measurement. Full disclaimer
Reaction Time
Respond the moment the panel lights up.
Start testAbout 2 minutes · demo and practice first
About this challenge
The time between a visual cue appearing and your response, as measured by your browser. Your result is the median of ten valid responses.
DurationAbout 2 minutes
Format3 practice trials, then 10 valid trials
Device and setupKeyboard (Space) or one touch target. Input lag differs between devices.
Accessibility limitsRequires seeing a colour and brightness change and responding quickly with one key or tap.
Free resultMedian response time in milliseconds
PrivacyYour answers are never sent to advertisers. Signed in, your results are saved to your account.