Browser Support & Accuracy

Supported browsers

The site is designed for current versions of Google Chrome, Microsoft Edge, Mozilla Firefox and Apple Safari. Very old browsers may not support every layout, sound or fullscreen feature.

Timing accuracy

The timers use your device clock and browser timing functions. Displays are corrected against elapsed time, but operating systems can still pause or restrict background pages.

• Keep the device awake for important alarms.
• Check that the browser tab and device are not muted.
• Disable aggressive battery-saving for long sessions.
• Use dedicated equipment when exact timing is critical.

Fullscreen and sound

Fullscreen availability depends on browser support and may require a user action. Browsers also commonly block sound until you have interacted with the page, so start or test the timer before relying on an alarm.