Runs entirely in your browser - no upload, no sign-up.
Keyboard: keep focus on the test area, then use Space or Enter. Touch and mouse input work too.
A reaction time test measures the delay between seeing a visual cue and responding to it. Wait for the panel to turn green, then click, tap, or press a key as quickly as you can. Five rounds produce a median score in milliseconds, plus your average, best result, and consistency.
Click, tap, or press Space while the test area is focused to begin the first round.
Keep watching during the random pause. Do not guess, because an early response is marked as a false start.
Respond as soon as the panel turns green. Your time appears in milliseconds after each valid round.
Repeat until the tool reports your median, average, fastest time, and spread between the fastest and slowest rounds.
This test uses a random pause before every cue so you cannot learn the timing. A click during the waiting state is marked as a false start and does not enter your score. All timing and scoring happen locally in your browser, and no results are uploaded.
The timer uses the browser's high-resolution performance clock. Your displayed result still includes monitor refresh, input-device latency, and browser scheduling, so compare sessions on the same device for the most useful trend.
Yes. You can run unlimited five-round reaction time tests for free, with no account, download, or score limit. The test works directly in a modern browser with a mouse, keyboard, trackpad, or touchscreen.
No. The random cue, timing, score calculation, and round history all run locally in your browser. Your reaction times are not sent to a server or saved to an account. Reloading or leaving the page clears the current session.
Each session uses five valid attempts. False starts are not recorded and you retry the same round. Five attempts are quick enough to finish in under a minute while reducing the influence of one lucky, distracted, or unusually slow response.
Simple visual reaction times on web tests often fall around 200 to 300 milliseconds, but device latency can shift the result. Treat the bands here as a friendly benchmark, not a diagnosis. Your best comparison is against your own earlier sessions on the same hardware.
Touchscreen processing, display refresh, browser scheduling, and the distance your finger moves can add delay. A wired mouse and a faster-refresh display may report a lower time. Compare devices as complete setups rather than assuming one result measures only your nervous system.
The browser clock can measure short intervals precisely, but the visible cue and your input travel through hardware and operating-system layers. This makes the test useful for personal benchmarking on a consistent setup, but it is not a clinical or laboratory assessment.
No. A response before the green cue is shown as a false start and is not included in the median, average, best time, or round count. Click the test area again to retry that round with a new random wait.
