Alarm Clock
Set an alarm for any time of day and it rings, even in a background tab.
About this alarm clock
Set a time, give it a label, and it rings. You can have as many alarms as you like, each one on or off independently, with a snooze button and three sounds. Quick buttons cover the common case of "wake me in twenty minutes".
Alarms are stored on your device and survive a reload, so the page picks up where you left it. The one requirement is that the tab stays open β a closed tab cannot ring.
Why it fires on time even in a background tab
Browsers deliberately slow down timers in tabs you are not looking at, to save battery. An alarm that counts down second by second drifts badly as a result β sometimes by minutes over an hour.
This one compares against the actual clock on every tick instead of counting, so throttling changes nothing: whenever the browser next runs the check, it sees the target time has arrived and rings. The check also ignores anything more than twenty seconds into the minute, so reloading the page later in the same minute does not set it off again.
Common uses
- Naps β 20 minutes is the usual advice for a short nap that does not leave you groggy.
- Working to a deadline β an alarm at a fixed time nags less than a visible countdown.
- Reminders while at a computer β a meeting, a call, taking something out of the oven.
- Time-boxing β set an end time before you start a task rather than watching the clock.
Frequently asked questions
Will the alarm ring if I switch to another tab?
Yes. It checks the real clock rather than counting down, so a throttled background tab still fires at the right time. The tab does have to stay open, though β closing it stops everything.
Why can't I hear the alarm?
Browsers block audio until you have interacted with the page. Press Test sound once and the alarm will be audible afterwards. Also check the tab is not muted β a speaker icon appears on the tab if it is.
Can I set more than one alarm?
Yes, as many as you like. Each has its own label and can be switched on or off without deleting it.
Are my alarms saved if I close the page?
The alarms themselves are stored on your device and are still there when you return. They cannot ring while the page is closed, though.
Is there a snooze?
Yes β snooze adds a fresh alarm nine minutes out, which is the interval traditional alarm clocks used.