Hit start and the stopwatch begins. You can watch the numbers for the first three seconds, then they disappear and you’re on your own. Count in your head and stop when you think you’ve hit ten. The closer to 10.000, the better.
How close is close?
Within half a second means your sense of time is decent. Within 0.2 s is impressive, within 0.1 s is excellent, and under 30 ms is borderline uncanny.
Counting without a clock
Use the visible first three seconds to lock in a steady beat, then just keep that rhythm going to ten. Nerves tend to speed people up, so breathe and count a touch slower than feels natural.
FAQ
- Can I use the keyboard?
- Yes. With the button focused, press the spacebar to start and stop.
- What gets saved?
- Only your closest attempt, stored in this browser.

























