Precision · Test
Stop as close to 5.000 seconds as you can — with the clock, or without it.
No account. No tracking. Your results stay with you.
Stop at 5.000 seconds.
Press to start the clock, press again to stop it. Five rounds.
Works with Space, a click or a tap. The hidden-clock mode needs no vision once started.
Press to start a clock and press again when you think exactly 5.000 seconds have passed. In visible mode the clock counts up on screen; in hidden mode it disappears once started, so you rely on your own sense of time.
Both presses are timed with their events' own timestamps on the same high-resolution clock. Because the same input starts and stops the clock, most input delay cancels out. Five rounds.
error = |elapsed − 5000 ms| score = median error over 5 rounds tendency = mean(elapsed − 5000 ms)
The tendency tells you whether you usually stop early (negative) or late (positive). Visible and hidden modes are compared separately.
The test runs entirely in this browser tab. Results are saved only in this browser's local storage so you can compare with yourself — never uploaded, never tracked. You can clear them any time.