Reaction Time Test

How to use

1. Click Start and wait for the green signal.
2. Respond with a click/tap or Space as soon as the area turns green.
3. Complete five valid attempts. False starts do not count as valid samples.
4. Review average, median, best, worst, and local history.

What the result means

• Each sample is the time from the painted green signal to your response event.
• Average and median summarize five valid trials; false starts are counted separately.
• Local best average is stored only in this browser.

Limitations

• Results include user decision time plus input device, browser event path, and display pipeline latency.
• This is not a pure mouse or keyboard hardware latency lab measurement.
• Background tabs, focus loss, and reduced performance mode can interrupt or distort trials.

Troubleshooting

Clicks do nothing after Start

Make sure you wait for green. Early responses are false starts. Refocus the page and press Start again.

Test stops unexpectedly

Leaving the tab or unfocusing the window aborts a running trial for accuracy.

Related tools

• Keyboard Tester

  Press keys to verify browser keydown and keyup events across Windows, Mac, compact, and full-size layouts.

• Mouse Test

  Check mouse buttons, hold stability, movement path, and basic wheel events using the browser Pointer Events API.

• Double Click Test

  Analyze click intervals and possible unintended double-clicks using configurable browser event thresholds.

FAQ