Laps, splits, multiple simultaneous timers, sounds, auto-lap, target alerts, and export — all free and private in your browser.
Keyboard: Space start/pause · L lap · R reset · F fullscreen
Saved only on this device — never uploaded anywhere.
L) to record a split without stopping the clock. Each row shows the cumulative split time and the individual lap (segment) time since the previous lap.F or Esc to toggle.A split time is the total elapsed time from the very start up to that lap. A lap time (segment time) is only the duration of that one interval, measured from the previous lap. This tool shows both side by side.
It reads the system clock on every animation frame rather than counting ticks, so elapsed time stays accurate even if the tab is backgrounded, throttled, or the device lags.
Your session auto-saves to this browser every few seconds. Reloading or reopening the page within 24 hours offers the option to restore it exactly where you left off.
Yes. Use the "+" tab to create additional independent stopwatches — each has its own laps, title, and controls, useful for timing multiple people or tasks at once.
Yes. Click a lap's name to rename it, and use the notes field on each lap row to add a short description — both are saved with the session.
Auto-lap automatically records a lap every N seconds without you pressing anything. A target-time alert flags a lap (and can play a sound) when its split time goes over or under a threshold you set.
Yes. Copy laps to the clipboard, download a CSV or plain-text file, export/import full sessions as JSON, or generate a shareable snapshot image of your lap table.
No. Timing, laps, sounds, and history all run and stay entirely in your browser's local storage — nothing is sent to or stored on our servers.
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