Quarter-hour watch

Never miss a new quarter hour

Enable notifications that fire every 15 minutes. The service worker keeps the cycle going—even if you close the tab or switch apps.

Notifications

Waiting to be enabled

Alert tone Select “Browser default” if you want the system chime; choose a custom tone to hear audio inside the site. Interval Pick how often the alert fires.

Fire one alert immediately so you can confirm permissions and sound playback.

When the timer fires, the notification shows the current hour and minute. The built-in service worker keeps the clock running even when the tab is closed.

Checking background availability…