Reaction Time Test

A reaction time test measures how long you take to respond to a signal. In this visual reaction test, the signal is a green screen. Click, tap, or press Space or Enter when it appears; your result is the elapsed time in milliseconds.

Complete five valid rounds. The final score is their arithmetic average, rounded to the nearest millisecond. You can also see every round and your fastest response. Early clicks and interrupted attempts do not count toward the average.

There is no universal cutoff for this browser test. A smaller number means a faster recorded response, but display refresh rate, input hardware, browser load, and practice all influence it. Compare several five-round averages on the same device instead of treating one result as a percentile or diagnosis.

The test shows “Too soon!” and discards that attempt. Click again to retry the same round after a new random delay. Your completed rounds remain, and no time penalty is added to them.

Yes. Tap anywhere in the test area on a touchscreen. On desktop, click the area or focus it with Tab and use Space or Enter. Held keys are ignored after the first keydown. Keep the same input method when comparing results.

Your best completed five-round average is saved in this browser’s local storage when available. There is no account or online leaderboard, and the test does not upload your round scores. Restart clears the current session, while the personal best remains on this browser.

Leaving the tab or moving focus away interrupts an active attempt so time spent away is not counted as a reaction. Return and retry that round. Completed rounds are kept.