Stopwatch

A stopwatch that does not fall behind

The time here is not counted by ticking, but from the moment you started. It sounds like a detail, but it matters: a browser slows redrawing down on an inactive tab, and a stopwatch that adds hundredths on every tick drifts from reality by tens of seconds after a minute in the background. Here only the display slows down; the measured time stays right.

Laps

The lap button records a lap without stopping the clock. For every lap you see both its own time and the total since the start, and the fastest and slowest laps mark themselves. Useful for training intervals, for timing a repeated task and for tracking how long each item on an agenda takes.

The lap table copies to the clipboard. It pastes as three tab-separated columns, so it lands straight into cells in Excel and Google Sheets.

Keyboard control

• Space starts and stops the measurement.
• The L key records a lap while the stopwatch runs.

Frequently asked questions

Can I switch to another tab?

Yes. The stopwatch keeps measuring, only the display redraws less often. When you come back it shows the correct time.

Does the measured time survive closing the page?

No. Everything lives in the memory of the tab and nothing is stored, so closing the page clears the stopwatch and the laps. Copy the laps out before you leave.

How accurate is it?

The time comes from the browser's high-resolution clock, so it is accurate to the hundredth of a second. What it cannot account for is your reaction on the button.