Set an alarm for the next occurrence of a chosen time, see the time remaining, test the sound, and use fullscreen mode.
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Keep this page open and make sure your device is not muted. Fullscreen mode requests a screen wake lock when supported.
The alarm is saved in this browser and survives a reload. It does not sync across devices or after site data is cleared.
Rings at a chosen clock time.
Counts a duration down to zero.
Counts upward and records elapsed time.
The setting is saved, but a closed webpage cannot play sound. Reopen the page before the alarm time.
Usually, although background limits, sleep mode, or power saving can delay it. Use a system alarm for critical reminders.
Check mute settings, media volume, and whether the browser allows this tab to play sound.
This tool stores one alarm at a time. Setting a new one replaces the previous time.