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 can be assigned its own sound, so you can tell alarms apart by ear rather than checking the screen every time one goes off. When an alarm fires, the tool can also trigger a browser notification, which means you'll get an on-screen alert even if the alarm tab isn't the one you're currently looking at.

Because everything runs client-side, no alarm data is uploaded anywhere — your schedule stays local to your browser session. One practical note: browser tabs need to stay open (and the device needs to stay awake) for the alarm to trigger, so it's best suited for a work session at your computer rather than an overnight wake-up call where the machine might sleep or the tab might close.