online stopwatch training
To time sets, intervals or any timed activity, this stopwatch runs entirely in the browser: no app to install, no account to create, with laps and sessions saved locally right on the device being used.
Each new mark lands at the top of the list with its accumulated total and a split calculated against the previous mark, with nothing to work out by hand.
Switching modes only changes how many decimal places show on screen; the time being counted keeps running without interruption.
Going past 8 saved sessions drops the oldest one; the entire history lives only in the browser used, with no syncing to another device.
The duration stays correct because it is always recomputed from the difference between two readings of the monotonic clock, not by adding up ticks. What may slow down is the on-screen drawing, since browsers throttle frame scheduling in hidden tabs. When you return to the tab, the displayed number jumps straight to the right value.
No: this is a browser stopwatch meant for informal use, uncertified and bound by whatever clock resolution each device happens to have. Official events use certified timing equipment and their own procedures that this stopwatch does not reproduce.
No: sessions are stored locally in the browser being used, up to a limit of 8 recent sessions, with no sign-up and no data sent to any server.
Yes: marking a lap is optional; the stopwatch keeps counting the total time normally even if no lap is ever marked, and the precision mode (seconds, centiseconds or milliseconds) still applies the same way.
The sound cue ships on by default, but it is an option that can be switched off at any time without affecting how totals and splits are recorded; lap marking keeps working normally with the sound off.
Times, laps and sessions stay in this browser's local storage only and are never sent to a server.