Stopwatch
Precise stopwatch with lap times and delta tracking
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About Stopwatch
Precise stopwatch with millisecond accuracy. Record lap times, view lap deltas, and track performance changes. Clean, distraction-free interface.
- Millisecond precision using high-resolution performance API
- Record unlimited lap times with split tracking
- Lap delta column shows faster/slower vs previous lap
- Color-coded green/red deltas for instant comparison
- Smooth display via requestAnimationFrame rendering
Everything runs in your browser — your data never leaves your device.
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How to Use Stopwatch
- Click Start to begin timing
- Click Lap to record a split time
- Click Stop to pause, Reset to clear everything
Frequently Asked Questions
How precise is the stopwatch?
It uses the browser's high-resolution performance API for millisecond-level precision, updated via requestAnimationFrame for smooth display.
What are lap deltas?
The delta column shows the difference between each lap time and the previous one. Green means faster, red means slower.
Can I export lap times?
You can select and copy the lap table data from the page. All timing is done locally in your browser.
