PlanetClocksOnline Alarm Clock
Set an alarm that rings in your browser at the time you choose, with three sounds and a snooze button.
Keep this tab open: the alarm runs in your browser and works offline, but it cannot ring if the tab or browser is closed.
How to set the alarm
Choose the time, pick a sound and press Set alarm. If that time has already passed today, the alarm is set for tomorrow. The status line shows when it will ring. When it goes off, press Stop to turn it off or Snooze to hear it again in five minutes. Use Test sound to check the volume beforehand.
Important limitations
This alarm runs inside the web page. It works without an internet connection once loaded, but your computer must stay awake and this tab must remain open. For waking up in the morning on a phone, the built-in clock app of your phone is more reliable, because browsers may suspend pages when the screen locks. The online alarm is ideal for reminders while you work at a computer: meetings, breaks, taking medicine or leaving on time.
If you allow notifications when asked, you will also get a system notification when the alarm rings.
Frequently asked questions
Does the alarm work if I close the browser?
No. The alarm needs the page to stay open. Your alarm setting is saved, so reopening the page restores it.
Can I choose my own song?
Not at the moment. You can pick one of three generated tones, which do not require any download.
Why is there no sound?
Make sure the device is not muted, the volume is up and that you pressed a button on the page at least once, which browsers require before playing audio.