Reaction time test
Free reaction time test: wait for green, then click, tap or press Space. Five rounds, median in milliseconds, false starts counted. Shareable result, no signup.
FIVE ROUNDS · ONE SHAREABLE RESULT
How quickly can you react?
Click, tap, or press Space when GO! appears. Keep the same input method for all five rounds. Early responses are retried, and the result uses the middle of your five times.
This measures your device and your response together. It is a practice game, with no ranking against other people.
How the reaction test works
Choose an input: mouse, touchscreen or the Space bar. Press to start a round, hold still while the panel is red, and respond as soon as it turns green. The delay before green changes every round, so it cannot be anticipated. Five valid rounds make a result; your score is their median, the middle value when the five are sorted. Lower is faster.
Responses under 100 ms are treated as anticipation, counted as false starts and retried. A response after ten seconds, a tab change or a loss of window focus invalidates the round and it is repeated. False starts are shown beside the result, because a fast median with three false starts is a different thing from a fast median with none.
What the number includes
The timer starts on the frame in which the panel is painted green and stops on your input event. Between the two sit your display’s refresh interval, the browser’s event scheduling, your mouse, keyboard or touchscreen’s own latency, and you. A browser test therefore reads slower than a laboratory measurement of the same person, by an amount that depends on the hardware, so two people’s results on different machines are not directly comparable. Two runs by one person on one machine with the same input are.
That is also why this page publishes no ranking and no “average reaction time” for its own visitors. A number that mixes phones, gaming mice and office laptops would describe the hardware more than the people.
Reading your result
The reaction time result guide walks through the calculation and the four descriptive ranges, and what to check when a result looks slower than you expect (distractions, browser extensions, a wireless mouse, a 60 Hz display). Compare retakes on the same device, browser and input. The number is not a percentile, an IQ score or a medical finding.
Share a repeatable description
The optional public card carries the median, the input method, the false-start count and the test version, with a permanent link, a preview image for LinkedIn and X, an Add to LinkedIn profile button and an HTML embed. The five timings are sent only when you request the card. No signup, and nothing goes to an employer.
Related free tests
- Memory test: visual tile patterns, ten levels and three lives.
- Typing speed test: sustained speed and accuracy over a minute.
- Attention to detail test: accuracy under a five-minute clock.