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Reaction Time Test
Reaction Time Test
What is this tool?
A reaction time test that runs entirely in your browser with millisecond precision. It times the gap between the trigger and your response using performance.now() and low-latency pointerdown/keydown events, so it measures your reflexes rather than browser lag. Three modes let you test visual reaction (react to green), auditory reaction (react to a beep) and choice reaction (pick the correct box, which adds cognitive processing time). Clicking before the signal is caught as a false start and doesn't count.
When to use it
- Checking your reflexes before a competitive gaming session
- Comparing your visual, auditory and decision-making reaction speeds
- Tracking whether sleep, caffeine or fatigue change your reaction time
- Challenging friends to beat your average on the same mode
- Just seeing how you stack up against the average human benchmark
How to use it
- 1Pick a mode — Visual, Audio or Choice
- 2Click Start and wait for the trigger (don't click too early)
- 3React as fast as you can with a click, tap, or the Space/Enter key
- 4Repeat for five attempts — false starts simply repeat the attempt
- 5Read your average, tier and percentile, then download the result card or copy your score
Frequently asked questions
How is the reaction time measured?
It uses the browser's high-resolution performance.now() clock and low-latency pointer/key events, timing from the moment the trigger appears (captured at paint) to your response — so it reflects your reflexes, not rendering delay.
What is a good reaction time?
Most people land around 250–300 ms on a visual test. Under 200 ms is elite gamer or athlete territory, and under 150 ms is exceptional. The tool grades every attempt against these benchmarks.
What happens if I click too early?
A click before the signal is flagged as a false start. That attempt doesn't count toward your average — you just repeat it, so guessing never helps your score.
How is the percentile calculated?
It's an estimate from the well-known distribution of human simple reaction time (mean ~273 ms). It's a model for context, not a live global leaderboard.
Are my scores saved or uploaded?
Your personal bests and history are stored only in this browser, and the test runs entirely on your device — nothing is sent to a server.