Best Reaction Test

The main test is the classic one: press the button, wait for it to turn green, and press again as fast as you can. Best Reaction Test runs that five times and gives you the median rather than a single lucky click, along with the average, best, worst and spread between attempts. A consistency score is based only on how much your five attempts varied.

It then puts the number in context. A curve shows where your median sits against published simple visual reaction-time research, and the page cites its references: a 10,060-person online sample with a median of 301 ms, and a calibrated study of adults with a 231 ms mean. Extras such as a Reaction Age, an animal comparison and a player archetype are labelled clearly as estimates or playful context, not clinical results.

Beyond the five-round baseline there are other modes. A survival game ends on your first early press, a sprint gives ten signals for a better read on variation, and a selective reflex test makes you react to targets while ignoring distractors, then reports misses and false alarms. An F1-style test uses a five-light start sequence, and an auditory test responds to sound instead of a visual cue. Guides cover average reaction times, what counts as good and ways to improve, and the site is available in 14 languages.

The about page explains that timing uses the browser's performance clock, and that your screen, mouse or keyboard, operating system and browser all add delay that stays in the score. So the result is useful for comparing your own runs on the same setup, not as a measure of your nervous system.

There's no account. Test results, recent sessions and a personal leaderboard with an optional name and region are stored in your browser and not uploaded. If you press Publish my result, only your median, best time, device type and date go into the public community stats, without a name, account or IP address. The privacy policy also describes analytics and advertising services that may run on the site.