Will the alarm work if I close the browser?
No. This alarm runs in the page, so the tab must stay open and the device must remain awake.
Online Alarm Clock
Set a browser alarm for a chosen local time with an optional label.
Calculations happen locally. We do not send your values to our server.
Example
Set 07:00, press Set alarm, and keep the tab open; the browser will sound the alarm at the next occurrence of that local time.
Calculation method
The selected hour and minute are converted to the next matching local date-time. A browser timer checks the clock and plays a short sound when reached.
Important notes
The tab must remain open and the device awake. Browser throttling, muted audio, sleep mode, battery saving, or a closed page can prevent the alarm.
Frequently asked questions
What if the selected time already passed today?
The alarm is scheduled for that time on the following local calendar day.
Why might I not hear a sound?
The device or browser may be muted, suspended, blocking audio, or applying background timer restrictions.