Personal performance challenge
Reaction Time Test
Take a free online reaction time test with randomized visual cues. Compare response time in milliseconds and keep personal bests locally in your browser.
Reaction pad
What this challenge measures
Reaction time measures the delay between a visual signal and your click or tap. This challenge uses a random waiting period so you cannot simply anticipate the change.
Scores are recreational and can vary by device, browser, display, input hardware, and environment. They are not diagnostic assessments.
About your score
Lower is better. Your personal best and recent completed runs are stored only in this browser on this device.
Free browser test · Speed & Reaction
How to use this online reaction time test
This browser reaction time test measures how quickly you click or tap after a visual signal changes. A randomized waiting period reduces simple countdown anticipation, making repeated runs more useful for comparing your own response speed on the same device.
Use the same mouse, trackpad, touchscreen, browser, and display when you want cleaner comparisons. Input hardware and display latency can change the number you see, so a personal trend on one setup is more meaningful than comparing a single score across different devices.
How the score works
The result is reported in milliseconds and lower is better. Advanced and Expert modes use multiple trials, which can make a session less dependent on one unusually fast or slow click.
Questions about this challenge
What does a reaction time test measure?
It measures the delay between a visual cue and your click or tap in the browser. The result includes human response plus device, browser, display, and input latency.
Why do reaction time scores change between runs?
Natural variation, attention, anticipation, input hardware, display refresh behavior, and browser workload can all affect a run. Repeating the test under similar conditions gives a more useful personal baseline.
Should I use a mouse or touchscreen?
Either works, but keep the input method consistent when comparing personal bests because a mouse, trackpad, keyboard, and touchscreen can produce different timing characteristics.