Set the alarm clock for 10:15 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 10:13 am Alarm clock for 10:14 am Alarm clock for 10:16 am Alarm clock for 10:17 am

Going to bed for a 10:15 am alarm

Asleep by 1:00 am — 6 full sleep cycles, about 9 hours
Asleep by 2:30 am — 5 full sleep cycles, about 7 hours
Asleep by 4:00 am — 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.

10:15 am across the country

Sydney	10:15 am
Brisbane	10:15 am
Adelaide	9:45 am
Perth	8:15 am
Darwin	9:45 am

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

How to use the online alarm clock

Between the commute and the first coffee, 10:15 am is often the last checkpoint before the day properly starts. This tool sets a browser alarm for 10:15 am that rings through your device's speakers, handy for a desk you're already sitting at or a laptop open on the kitchen bench.

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.

A browser alarm like this one is handy when your phone's on silent, charging in another room, or you just don't want to unlock it and get pulled into notifications. The trade-off is honesty: it only rings while this tab stays open, so it's not a replacement for your phone alarm on a trip where the laptop lid might close. On a 24-hour clock 10:15 am is written 10:15, and spoken aloud it's quarter past ten in the morning. Written the Australian way that's 10.15 am, and typed in a hurry it's often 10:15am. Setting the alarm to 10:15 am tomorrow morning works the same way: if the time has gone for today, the count runs through to it.

Common questions

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.

Do I need to create an account or download anything?

No, there's nothing to sign up for and nothing to install. Pick a time and a sound, press Start, and it runs entirely in this browser tab.