Online Alarm Clock

An online alarm clock turns any browser tab into a wake-up or reminder device without installing an app or plugging a physical clock into the wall. It solves a small but recurring problem: you need a timed alert while working at your desk, catching a short nap, timing a meeting break, or waking up when your phone is out of reach or on silent. Because it runs entirely in the browser, there's nothing to download and no account to create — you open the page, set a time, and the alarm is ready.

The tool lets you set multiple alarms at once, so you can queue up a 10-minute break reminder alongside a longer end-of-day alert without juggling separate apps. Each alarm has its own label, repeat days, one of five sounds, a volume level and an optional 5-minute snooze, so you can tell alarms apart by ear rather than checking the screen every time one goes off. If you allow notifications, an alarm that fires while you are in another tab also shows a system notification.

Alarms are saved in your browser's local storage, so they are still there when you come back to the page on the same device. An alarm without repeat days rings once and then switches itself off. The alarm itself only sounds while the page is open, though: the tab needs to stay open and the device awake, which makes it best suited to reminders during a work session rather than an overnight wake-up call where the machine might sleep.