Online Alarm Clock
Pick a time below. When it arrives, this page will alert you with sound and an on-screen message.
Keep this browser tab open — the alarm can only ring while the page is loaded.
How this alarm clock works
Set a time using your device's own time picker, and this page checks every second whether that time has arrived. When it does, you'll see an on-screen alert and hear a repeating tone generated directly in your browser — nothing to download, no notification permissions required.
Because it runs entirely in the page, the tab needs to stay open (even in the background) for the alarm to trigger. It won't work if the browser is fully closed.
Coordinating a call with someone in another time zone? Use the time zone overlap tool to find a good time first, then set this alarm as a local reminder.