The best alarm apps for heavy sleepers (and one that plants trees)

Somewhere right now, a phone is ringing on a nightstand, and the person next to it is fast asleep.

If that person is you, you already know the usual advice doesn’t help much. Go to bed earlier. Put your phone across the room. Buy a louder alarm. You’ve tried. You’ve slept through all of it.

I make an alarm app, so I’m not a neutral party here. I’ll be upfront about that, and I’ll be honest about the other options too, because the right alarm for you depends a lot on why you’re sleeping through the current one.

Why some people sleep through anything

Sleep comes in cycles, and the deepest part of each cycle (slow-wave sleep) is where your brain is hardest to reach. Sounds that would wake you from lighter sleep often don’t make it through. If an alarm happens to land in that window, it can ring for a long time before anything registers.

Being short on sleep makes this worse, because your body leans harder into deep sleep to catch up. And there’s a second problem that heavy sleepers know well: waking up just enough to turn the alarm off, then remembering nothing. That groggy half-awake state is called sleep inertia, and it’s very good at hitting “stop”.

So a good alarm for heavy sleepers has two jobs. It has to get through, and it has to keep you up long enough for your brain to actually join in.

What to look for

Loudness matters, but it’s only half of it. The things worth checking:

Does it ring on silent and in Focus? Since iOS 26, alarm apps built on Apple’s AlarmKit can ring through Silent mode and Focus just like the built-in Clock app. Older apps relied on workarounds that could fail if the app was closed.
Can you turn it off half asleep? If one tap kills the alarm, sleep inertia wins. Look for a task you have to finish first.
Is there a backup? Some apps will ring again if you don’t confirm you’re up.
What does it cost, really? Most alarm apps are free to download and charge for the good parts.

The built-in Clock app

It’s free, it’s already on your phone, and it’s reliable. It rings through Silent mode and Focus, and you can turn snooze off entirely.

What it can’t do is make you prove you’re awake. One tap and it’s gone. If your problem is that you don’t hear the alarm, the Clock app might be fine once your volume settings are sorted out. If your problem is that you turn it off without remembering, it won’t help.

Best for: people who mostly need a reliable alarm and a bit more volume.

Alarmy

Alarmy is the best-known app in this space, and for good reason. It has a huge following, with around 250,000 ratings on the US App Store at 4.8 stars, and a long list of “missions” you complete to stop the alarm: math problems, memory games, shaking your phone, squats, and taking a photo of something specific.

It’s free to download, with a Premium subscription. The App Store lists plans ranging from $4.99 up to $59.99 a year, and reviews generally say the free version includes ads and that some missions are Premium-only. It supports older iPhones too, back to iOS 17.

Best for: people who want the widest range of missions and don’t mind paying for the full set.

SureWake

SureWake takes a slightly different approach. It’s built on AlarmKit, and instead of a long list of missions it focuses on making sure you don’t drift back off: after you stop the alarm, you’re asked to confirm you’re awake with a tap, a few quick sums, typing a sentence, or shaking your phone. If you don’t confirm in time, a backup alarm rings with a stronger tone.

At the time of writing it’s listed as a one-time purchase rather than a subscription, which some people will like a lot.

Best for: people who fall back asleep after turning the alarm off.

SproutAwake

This is mine, so take this section with a pinch of salt.

SproutAwake is built for heavy sleepers: loud alarm sounds, and wake-up missions you have to finish before it goes quiet: solving a math problem, finishing a puzzle, unscrambling a word, shaking your phone, or finding a household object. It’s built on AlarmKit, so it rings through Silent mode and Focus, and you earn points and build streaks for not snoozing.

The part that’s different: 50% of SproutAwake’s proceeds go to One Tree Planted, a reforestation nonprofit that plants in over 80 countries. We post the number of trees planted every month on TikTok.

It’s free to download, and Pro is $4.99 a month or $29.99 a year. It’s rated 4.8 on the App Store, from a much smaller crowd than Alarmy’s (54 ratings so far). It needs iOS 26 or later and isn’t on Android yet.

Best for: heavy sleepers who’d like their mornings to do something useful.

So which one?

If you’re not sure what’s going wrong, start with the free Clock app and check your volume settings. You might not need anything else. If you’re turning the alarm off without waking up, any of the mission-based apps will help, and it mostly comes down to which missions you can stand at 6am and how you feel about subscriptions.

And if you’re going to be dragged out of bed by an app anyway, it might as well plant a tree while it’s at it.

Try SproutAwake on the App Store →