The best alarm apps for heavy sleepers

What makes an alarm app work for a heavy sleeper?

Three things, in order: it has to be able to ring at all when your phone is silenced or in Focus; it has to survive being dismissed by someone who is not really awake; and it has to avoid becoming a sound you learn to ignore. Most apps solve one of these. Very few solve all three.

Before the apps, the two failure modes worth naming — because they determine which category will actually help you.

• You never hear it. Usually a volume, Focus or notification problem, and sometimes habituation: the same tone every day, until your brain files it under “ignorable”.
• You hear it and dismiss it asleep. Dismissing an alarm is a practised motor action. It does not require you to be conscious, and frequently is not.

A note on iPhone specifically

For most of the iPhone’s life, third-party alarm apps could only post notifications — which Silent mode and Focus are entirely free to mute. It is why so many alarm apps have a review section full of people who slept through them, and it is not really the developers’ fault.

iOS 26 changed this with AlarmKit, which lets approved apps schedule genuine alarms that ring through Silent and Focus like the built-in Clock. If you are on an iPhone and you have ever been let down by an alarm app, that is the single most important thing to check before you install another one.

The apps

Apple Clock — the baseline

Free, already installed, and more capable than people assume. It rings through Silent and Focus, and since iOS 26 you can set a custom snooze duration from one to fifteen minutes, per alarm.

Good for: most people, honestly. Try this before paying for anything.
Falls down when: you need more than one alarm and end up hand-building a stack of them every night, all with the same sound, each one presenting a snooze-or-dismiss decision you are in no state to make.

Alarmy — friction as the mechanism

The best-known app in this category. It refuses to switch off until you complete a “mission”: solve maths problems, type a phrase, shake the phone, take a set number of steps, or photograph a specific place in your home — the bathroom sink is the classic — which forces you physically out of bed.

Good for: people who genuinely will not get up otherwise, and who do not mind an adversarial relationship with their alarm.
Falls down when: you learn to complete the mission while still asleep, which happens more than you would think; or when dreading the alarm starts making the evening worse too. See Alarmy alternatives.

Sleep Cycle — waking at a lighter moment

Tracks your sleep with the microphone or accelerometer and rings within a window — typically up to thirty minutes before your set time — when it judges you to be in lighter sleep. The reasoning is sound: grogginess depends heavily on the stage you are woken from.

Good for: people whose problem is the quality of the wake-up rather than missing it entirely.
Falls down when: a partner, a pet or a restless night confuses the detection, and when you need a guaranteed time rather than a probabilistic one. Its window is chosen for you by a sensor; you cannot say “never before 7:00” and mean it in the way you can with a scheduled alarm.

Gradual and gentle alarms — Progressive Alarm Clock, Wonderwake, and similar

A small category built on the opposite instinct to Alarmy: start quiet and build. Sounds fade in over several minutes, sometimes escalating to a louder fallback if you have not responded.

Good for: people who find sudden loud alarms genuinely unpleasant and start the day rattled.
Falls down when: you are a heavy sleeper in the literal sense — a gentle ramp inside a single alarm is still one alarm, and if you sleep through the ramp there is nothing behind it.

Slowrise — a ladder instead of a single alarm (ours)

This is our app, so treat this section accordingly. The premise is that if you are going to snooze — and most people do, and it costs less than you have been told — the useful move is to plan the snoozing rather than fight it.

You set a window once: when you would like to start waking, and when you must be up. Slowrise fills it with a ladder of separate alarms whose gaps tighten toward the deadline, each rung louder and more insistent than the last, with a different sound. Every rung is scheduled as its own real alarm via AlarmKit, so it rings through Silent and Focus, and so silencing one never adds or removes another — the next is already on the books. Only the final alarm carries a snooze, worth two minutes.

Good for: people who set five alarms and snooze all five, and want that to be a plan rather than a nightly emergency.
Falls down when: you are not on iOS 26 — it requires it, because without AlarmKit it could not ring through Silent and would be quietly useless. There is no Android version yet. And if you want to be woken once, sharply, at a single time, this is more machinery than you need.
Free. On the App Store.

How to choose

One caveat that applies to every app here: none of them substitutes for enough sleep. If you are consistently short, no alarm design will make the morning pleasant, and persistent unrefreshing sleep is worth taking to a doctor rather than to the App Store.