Time anything with start, pause, lap, and reset controls, accurate to the centisecond.
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About this tool
A precise browser stopwatch for timing workouts, tasks, or presentations. Start, pause, and resume freely, record lap splits while it runs, and reset when you're done. Nothing is saved or sent anywhere — closing the tab clears it.
Click Start to begin timing, Lap to mark a split without stopping, and Pause/Reset to stop or clear — accurate to the centisecond, running entirely in your browser.
Why use Tabreon for this?
No account, and nothing interrupts a running stopwatch — it keeps counting even if you switch tabs.
Lap times show both the split and the cumulative time, so you can review a full sequence at a glance.
Everything runs client-side in your browser — no page reload, no server round-trip while timing.
How to use the stopwatch
1Start. Click Start to begin timing immediately.
2Lap or Pause. Click Lap to record a split without stopping, or Pause to stop the clock.
3Reset. Once paused, click Reset to clear the time and lap list and start over.
What is an online stopwatch?
A stopwatch measures elapsed time from the moment you start it until you stop it, typically with the ability to record "lap" times — intermediate splits — without interrupting the running clock. It's used for timing workouts, presentations, cooking, games, and any task where you need a precise, running count of elapsed time.
How Tabreon handles your data
The stopwatch runs entirely in your browser using your device's clock — no timing data is sent to or stored on a server.
Key features
Centisecond precision (mm:ss.cc)
Unlimited lap recording with split and cumulative times
Pause and resume without losing elapsed time
Keeps running accurately even in a background tab
Common use cases
Timing workout intervals or rest periods
Recording lap splits during practice runs
Timing how long a task or presentation actually takes
Common mistakes & limitations
Precision depends on your browser tab staying open — closing the tab or the device sleeping clears the running time.
Frequently asked questions
Yes. The stopwatch computes elapsed time from a fixed start timestamp rather than counting ticks, so it stays accurate even if the tab is backgrounded or throttled.
There's no limit — record as many laps as you need during a single run.
No. Everything runs in your browser and resets when you click Reset or leave the page — nothing is sent to a server.