Alarm clock

Read this before you rely on it

This alarm runs in your browser. It rings only while this tab stays open and the device is awake: it cannot wake a sleeping phone or computer, and closing the tab cancels it. While armed, the page asks the screen to stay on where the browser allows it. Background tabs can be slowed by the browser, so the alarm may ring up to a minute late if you switch away. Keep the volume up, because the sound plays only after you press Start alarm.

The alarm follows this device's clock and time zone, including daylight saving changes. For a critical wake-up, use your phone's built-in alarm as well. To count down a length of time instead, use the timer.