Reaction Time Test — measure your reflexes in milliseconds the instant the screen turns black
Watch the screen and tap the moment it turns black; the app records exactly how many milliseconds you took to react. It runs five measurements and averages them, so you see your real reflex speed rather than one lucky tap — perfect for warming up before a game or challenging a friend.
How to use
- Tap the screen to start a session.
- While the background stays gray, hold still — then tap the instant it turns black.
- Repeat for five rounds to reveal your average reaction time and rating.
- Tap again to start a fresh session (the spacebar or Enter also work).
Features & tips
- Shows all five individual times, the average, and your fastest single result.
- Tapping before the screen turns black is flagged "Too soon!" and voided, so react instead of guessing.
- Your average earns a rating: pro-gamer level, fast, average, or relaxed.
- Your best average is saved in the browser, so it stays for your next visit.
FAQ
Q. What counts as a good reaction time? A. An average under 200 ms is pro-gamer level and under 250 ms is fast. Most people fall between 250 and 350 ms.
Q. Why does the wait before "go" vary each time? A. The signal appears at a random point between 1.5 and 4 seconds so you cannot memorize the timing.
Q. Are my scores uploaded anywhere? A. No. Only your best average is stored in this browser and nothing is sent to a server.
