Reaction Time Test
Click when the panel turns green and compare your five-round average.
How to play: click Start, wait for green, then click the panel as fast as you can.
Test visual reaction speed
This reaction time test runs five rounds so one lucky click does not define the result. Press Start, keep your pointer over the panel, and wait until the waiting state changes to green. Clicking before the color changes is treated as a false start, which mirrors the way reaction tests usually reject guesses.
At the end, the page reports each valid round and your average in milliseconds. A result near 250 ms is common for a simple screen-based test, while lower numbers usually require focus, a responsive mouse, and a display with little latency.
Read your result as the average across the five valid rounds. Reaction times drift with fatigue, caffeine, and screen refresh rate, so run it a few times rather than trusting a single click. The green cue appears after a random delay to stop you anticipating it.
Private personal best
The best average is stored only with localStorage in your browser. Use the number for casual comparison, not medical, hiring, or safety decisions, because hardware, frame rate, caffeine, fatigue, and browser focus can all influence the timing.
Frequently Asked Questions
How is my reaction time measured?
The test records the milliseconds between the box turning green and your click using the browser high-resolution timer, then averages five rounds.
What is a good reaction time?
Most people land around 200 to 300 ms to a visual cue, and under 200 ms is fast. Your display refresh rate and mouse add a little unavoidable latency.
Why was my click marked too early?
If you click before the box turns green the round is discarded and repeated, so guessing does not lower your average.
Is my score saved anywhere?
Your best time is kept only in this browser via localStorage and is never uploaded.
Browser-based tests, solvers, and games you can use privately online.