Stopwatch

Precision stopwatch with lap timing — millisecond accuracy via performance.now(), best/worst lap detection, CSV export, deep-link state, keyboard shortcuts. 100% client-side, no network.

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Precision

Show hours Progress ring

Tips & keyboard shortcuts

• Space — start / pause

• L — record a lap (while running)

• R — reset (clears timer and laps)

• Timing uses performance.now() for sub-millisecond accuracy, immune to tab-throttling drift on resume.

• Laps persist in your browser and can be exported to CSV. State is shared via URL hash.

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