Set the alarm clock for 5:51 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 5:49 am Alarm clock for 5:50 am Alarm clock for 5:52 am Alarm clock for 5:53 am

Going to bed for a 5:51 am alarm

Asleep by 8:36 pm — 6 full sleep cycles, about 9 hours
Asleep by 10:06 pm — 5 full sleep cycles, about 7 hours
Asleep by 11:36 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.

5:51 am across the country

Sydney	5:51 am
Brisbane	5:51 am
Adelaide	5:21 am
Perth	3:51 am
Darwin	5:21 am

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

Online alarm clock for 5:51 am

You’re packing up and heading out at 5:51 am, with a work site beyond town and a ninety-minute drive ahead. An alarm at this exact time can mark the moment to pick up the keys, check that the ute is ready and leave before 6:00 am, rather than letting the last few jobs stretch into departure time.

For this early drive, the alarm needs audible permission as much as the correct time. After 5:51 am is selected, the sound setting should be checked alongside the phone’s silent mode and browser audio permissions; a visible alert alone may be easy to miss while gathering gear. The alarm for the drive will not sound if the browser session has ended or the system has put it to sleep, so a separate fallback is sensible when leaving on time matters.

As you step outside, listen for the shift from overnight quiet to the first traffic, delivery vehicles and birds. At this hour, a quiet indoor alarm can seem clear but become harder to hear once doors open or an engine starts. Keeping the phone nearby until 5:51 am, with the volume tested against that changing background noise, makes the departure cue easier to notice before the road gets busier.

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.