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⏰ Online Alarm Clock
Set a simple alarm in your browser — it counts down, then beeps and alerts you at the time you choose.
About this Online Alarm Clock
Online Alarm Clock turns this browser tab into an alarm clock — no app, no account. Pick a time, add a label, and the page counts down the remaining hours, minutes and seconds. When the time arrives it plays a clear beeping tone using the Web Audio API and pops up an alert with your label.
How to use it
- Choose the alarm time (times earlier than now are set for tomorrow).
- Add an optional label like 'Oven' or 'Meeting'.
- Press Set alarm and keep this tab open.
- When it rings, press Stop / Cancel to silence and clear it.
Example
At 6:20 PM you set a 45-minute power-nap alarm labeled 'Nap over' — at 7:05 PM the tab beeps and shows your message.
Frequently asked questions
Does the alarm work if the tab is in the background?
Yes, the countdown keeps running in a background tab, but keep the device awake and the tab open; a closed tab cannot ring.
Why is there also a popup alert?
The popup guarantees you notice the alarm even if the tab is muted or you are looking at another window.
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