Reaction Test
Brain TrainingFree to playFive rounds, random delay, one click. The panel turns green between 0.8 and 2.5 seconds in — your average reaction time is graded in milliseconds.
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How to Play
Reaction Test measures how fast you respond over five rounds. Press Start and the panel turns red with the instruction to wait. After a random delay between 0.8 and 2.5 seconds the panel turns green — click it as fast as you can. The timer only runs from the moment the panel turns green, so the random wait is there to stop you from guessing the rhythm.
Each green click records your time in milliseconds and immediately starts the next round's wait. Clicking while the panel is still red is a false start: the round restarts with a new random delay and nothing is recorded, so patience is part of the test. After the fifth round you get your average across all five clicks plus the individual times, and your best average is stored in this browser.
Skip to result ends the test early with fixed values for any rounds you have not finished — useful if you need a number right now. New test resets everything for a fresh set of five rounds.
Controls
- Start test - begin the five-round sequence
- Click the large panel when it turns green
- Skip to result - finish early with placeholder times
- New test - reset the round counter
Tips & Tricks
- 1Rest your clicking hand loosely — tensed muscles start the motion late, which adds 30 to 50 milliseconds before you even move
- 2Watch the panel with your peripheral attention and breathe out during the wait; holding your breath makes the click twitchy
- 3Do not anticipate: a false start restarts the round, so a guessed click at 700 milliseconds costs you the whole wait
- 4Your second round is usually your fastest — the first calibrates your expectation of the delay
- 5Averages under 250 milliseconds are excellent for a mouse click; touch screens typically run 30 to 60 milliseconds slower
- 6Fatigue is real: reaction times measurably degrade after ten consecutive tests, so compare within a session, not across the day
- 7Screen latency counts — a 60 Hz display adds up to 16 milliseconds of unavoidable delay to every result
Frequently Asked Questions
When does the timer actually start?
At the moment the panel turns green. The red waiting period is random and never counts against you.
What happens if I click too early?
The click is flagged as a false start and the same round restarts with a fresh random delay. No time is recorded.
How many rounds is a full test?
Five green clicks. The result screen shows each individual time and the average across all five.
Is a lower or higher score better?
Lower. The score is milliseconds between green appearing and your click, so smaller numbers are faster reactions.
Where is my best average saved?
Locally in this browser. Clearing site data or switching devices resets the record.
Why is my phone score slower than my computer?
Touch digitizers and screen refresh add delay. A 30 to 60 millisecond gap between mouse and touch is normal and expected.
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