Set the alarm clock for 3:24 am

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::

You can also try the other alarm clocks

Alarm clock for 3:22 am Alarm clock for 3:23 am Alarm clock for 3:25 am Alarm clock for 3:26 am

Going to bed for a 3:24 am alarm

Asleep by 6:09 pm — 6 full sleep cycles, about 9 hours
Asleep by 7:39 pm — 5 full sleep cycles, about 7 hours
Asleep by 9:09 pm — 4 full sleep cycles, about 6 hours

A sleep cycle runs about 90 minutes, and most people take around 15 minutes to drop off. Waking at the end of a cycle feels easier than waking in the middle of one.

3:24 am across the country

Sydney	3:24 am
Brisbane	3:24 am
Adelaide	2:54 am
Perth	1:24 am
Darwin	2:54 am

Times are worked out live in your browser, so daylight saving is already accounted for.

How to use the online alarm clock

An alarm at 3:24 am in the dead of night usually means a red-eye flight, a delivery run, or a newborn's next feed. This sets a browser alarm for 3:24 am that rings through your laptop speakers, so you don't need to fumble for your phone in the dark. Leave the tab open and it'll do the waking for you.

There's a short list of sounds to choose from before you press Start — pick one that suits how deep a sleeper you are. Once it's set, the page keeps time in the background of your browser, and it'll sound at the moment you selected, provided the tab hasn't been closed.

Compared to a phone, this alarm has one job and nothing else competing for attention — no messages, no app switching. It's free and doesn't ask for sign-up, but it only works while the tab is open and the device stays awake, so it suits daytime use at a desk better than an overnight bedroom alarm. On a 24-hour clock 3:24 am is written 03:24, and spoken aloud it's twenty-four minutes past three at night. Timetables and rosters may show it as 03:24, and handwritten notes as 3.24 am. If you need it loud, turn the system volume up before you start: the alarm plays at whatever the device is set to.

Common questions

Why use a browser alarm instead of my phone's built-in one?

Mainly for reliability against silent mode, do-not-disturb, or a phone left charging out of earshot. It's a useful backup or a desk-based alternative, though it depends on this tab staying open rather than running in the background of your phone.

Is there a cost to use this?

No, it's free, with no sign-up and no limit on how many times you set it. It just needs the tab left open until the time you've chosen arrives.

Will the alarm still ring if I close the browser tab?

No. The alarm only runs while this tab stays open — closing it, or closing the browser entirely, stops the countdown before it can ring. Keep the tab open in the background if you need it to go off later.

Does the alarm work if my laptop goes to sleep?

Not reliably. If the device sleeps or the screen locks, the browser tab pauses along with it, so the alarm may not fire on time or at all. Adjust your power settings if you're relying on this over a longer stretch.