A precise online timer and stopwatch with lap tracking, countdown alarms, and millisecond accuracy. No app needed — works directly in your browser.
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This utility is a high-performance node optimized for modern browser environments. All data processing is executed client-side, ensuring zero knowledge transfer to external servers.
Click 'Start' to begin timing, then click 'Lap' to record split times without stopping. Each lap shows the split time and cumulative time. Click 'Stop' to pause and 'Reset' to clear.
This stopwatch uses the browser's requestAnimationFrame API (linked to your display refresh rate), making it accurate to within 1-2 milliseconds — precise enough for most timing needs.
Yes. Switch to Timer mode, enter your desired time (e.g., 25:00 for 25 minutes), and click Start. An audio alert will play when the countdown reaches zero.
Browsers throttle JavaScript in background tabs. For best accuracy, keep the timer tab active or use your screen's picture-in-picture mode. The timer will still run, but may be slightly delayed.
Yes. The lap function is perfect for tracking interval training. Record each set or round and compare your split times to monitor performance.