Online Alarm Clock

About the Online Alarm Clock

Set one or more alarms for a time of day — once, every day, on weekdays or on any days you pick — each with a label, its own tone and a snooze length. Every alarm shows how long is left until it rings, and the page shows the current time in large digits, so it works as a bedside clock too.

When an alarm rings, the tone repeats until you press Stop or Snooze, the browser tab flashes, and — if you allow it — a notification appears. Alarms are saved in this browser and keep their schedule across reloads. The page has to stay open: a website cannot ring once its tab is closed, and phones may pause pages in the background or when the screen locks. The page asks the browser to keep the screen on while alarms are set.

Common uses

• Waking up with a laptop or a phone on the bedside table.
• Reminders at a fixed time: medicine, a class, a meeting, prayer times you enter yourself.
• Several alarms on different days for shifts or a weekly routine.
• A large clock on a spare screen, with the alarms below it.

Keep the page open

Alarms run inside this tab. Close the tab, and nothing can ring; when you come back, alarms that passed are listed as missed rather than ringing late. For an alarm you rely on:

• Keep the page open and in front. Some browsers check timers in hidden tabs only about once a minute, so an alarm in a background tab can be late.
• On a phone, keep the screen on (the page asks for this through the Screen Wake Lock API, which the browser releases whenever the page is hidden) and plug in the charger.
• Turn the volume up and press Test tone. On iPhone the ring/silent switch can mute website sounds.
• For anything critical, also set your phone’s own alarm app.

Snooze, stop and missed alarms

Snooze silences the alarm for the snooze length you chose (5, 9, 10 minutes or more) and then it rings again. An alarm that nobody answers stops by itself after the ringing time set under Settings (10 minutes unless you change it). A one-time alarm switches itself off once it has rung; a repeating one waits for its next day.

If the page was closed or the device was asleep, an alarm that is still within its ringing time rings as soon as the page runs again; one that is later than that is shown as missed.

Daylight-saving time and travel

Alarms follow the clock of this device. If your time zone changes, they ring at the same local time in the new zone. On the night clocks go forward, an alarm in the skipped hour rings when the clock reaches that time after the change (2:30 becomes 3:30); on the night they go back, an alarm in the repeated hour rings once — the first time, or the second time if you set it in between.

Limitations

• Alarms only ring while this page is open. They cannot wake a phone that has suspended the browser or a computer that is asleep.
• On iPhone and iPad, notifications only work for web apps added to the home screen, and the silent switch can mute sounds.
• Up to 20 alarms. The tones are generated by your browser; you cannot upload your own sound.

Privacy

Everything happens in your browser. What you enter or open here is not uploaded or stored by MySmartCoPilot.