Timer / Stopwatch
Set a countdown alarm or use the stopwatch to track time.
About High-Precision Timer & Stopwatch Engine
The HayaBoost Timer & Stopwatch provides millisecond-accurate countdown alarms, interval tracking, split-lap recording, and persistent background timekeeping built on modern HTML5 Web Worker architecture.
Overcoming Browser Throttling with Web Workers
Standard JavaScript setInterval() and setTimeout() timers suffer from severe timing drift when a browser tab is minimized or placed in the background due to modern browser power-saving CPU throttling (which clamps background timers to once per second or less). This tool runs time calculations against system epoch timestamps (performance.now() and Date.now()) inside an isolated Web Worker thread, ensuring zero timing drift regardless of tab switching or system sleep.
Frequently Asked Questions (FAQ)
Will the alarm sound if my browser tab is in the background?
Yes. The Web Audio API synthesizer triggers the audio alarm even when the tab is running in the background.
Can I record split lap times during stopwatch runs?
Yes. Click the "Lap" button while the stopwatch is running to record intermediate split times in a formatted table.