Loudness is not what wakes a heavy sleeper — a dismiss task is. If you can turn off a 100-decibel alarm and remember nothing about it, a louder tone will not fix that. What changes the outcome is an app that will not stop ringing until you have done something that requires you to be genuinely awake.
Quick answer: Alarmy is the safest default (50M+ downloads, 4.7 stars, the widest mission set). Alarm Clock Xtreme is the best free puzzle alarm at scale. AMdroid has the most unusual dismissal options, including NFC tags. Sleep as Android is best if you want sleep tracking too. Arisely is the only one with a camera-verified push-up mission — but it is a brand-new app, and we say so plainly below.
Why heavy sleepers sleep through alarms
It is worth being precise about the failure, because it decides which feature matters.
Dismissing an alarm is a reflex. It requires locating a phone and tapping a large button — something a sleeping brain can execute without ever reaching meaningful consciousness. This is why people genuinely do not remember turning off alarms: the action completed before awareness did.
Layered on top is sleep inertia, the grogginess in the minutes after waking, which is at its worst when you are woken from deep sleep — exactly where a heavy sleeper spends more of the night. During inertia, judgment and self-control are measurably impaired, which is the worst possible moment to ask someone to decide to get up.
So the two things that actually work are: removing the one-tap dismiss, and forcing movement or cognition before the alarm stops. Volume helps you hear it. Neither of those is volume.
The 5 features that decide whether you get up
- Exact-time alarms. If Android’s battery optimisation can delay the alarm, nothing else matters. It must fire on time with the phone locked and the app closed.
- Alarm-channel volume. It must play on Android’s dedicated alarm audio channel, so it stays loud through muted media and Do Not Disturb.
- Dismiss-by-task missions. The single biggest failure point is the one-tap off. A task — maths, typing, steps, a barcode across the room, push-ups — defeats the reflex. Chaining several in a row is stronger still.
- Snooze control. The ability to cap snoozes or disable them. Snoozing fragments your last sleep cycle and usually deepens inertia.
- No account, local data. An alarm clock has no reason to need an email address.
The 6 main options compared
All figures are from each app’s Google Play listing, checked in October 2026. Ratings and download counts move, so treat them as a snapshot.
| App | Downloads | Rating | Ads (free) | Ways to dismiss | Price |
|---|---|---|---|---|---|
| Alarmy | 50M+ | 4.7 | Yes | Photo, barcode, maths, memory, typing, shake, squat | Free + Premium |
| Alarm Clock Xtreme | 50M+ | 4.5 | Yes | Maths, retype password, QR/barcode | Free + upgrades |
| Sleep as Android | 10M+ | 4.6 | Yes | CAPTCHA: maths, sheep counting, barcode | 7-day trial, then freemium |
| AMdroid | 5M+ | 4.3 | Yes | Maths, CAPTCHA, Wi-Fi, NFC, barcode/QR, light | Free + Premium |
| Arisely | 100+ (new) | Not yet rated | Yes — one banner, never on the ring screen | Maths, memory, code, sequence, typing, trivia, shake, steps, QR/barcode, AI push-ups — chainable | Free + Pro |
| Google Clock | 1B+ | 3.9 | No | None — one tap | Free |
Two patterns stand out. Every mission alarm here is ad-supported in its free tier, Arisely included; only Google Clock is ad-free, and it has no missions at all. And the missions have converged — nearly everyone has maths and barcode. What separates these apps is where the ads appear, what removing them costs, and whether any mission actually gets you out of bed.
Alarmy — the default pick
50M+ downloads · 4.7 stars · free with ads + Premium
Alarmy is the app most people mean when they say “an alarm you can’t turn off,” and it earns that. The mission set is the broadest here — photo of a specific place, barcode, maths, memory, typing, shake and squat — and its Wake Up Check restarts the missions if you don’t confirm you’re awake shortly after dismissing, which closes the “dismiss then fall back asleep” loophole that defeats most alarms.
- Best for: most heavy sleepers. If you want one app that works and don’t want to think about it, this is it.
- Trade-off: the Play listing marks it as containing ads, Wake Up Check and some sounds are Premium, and it asks for a long permission list for an alarm clock — location, camera, device admin and accessibility, all optional.
Alarm Clock Xtreme — best free puzzles at scale
50M+ downloads · 4.5 stars · free with ads
Over a million reviews and a genuinely useful free tier. Its puzzles — maths with five difficulty levels, retyping a password, or scanning a QR code you printed and left across the room — trigger only when you hit dismiss. It also lets you cap snoozes and shorten the snooze interval, which matters more than it sounds.
- Best for: a free, proven mission alarm from a large developer.
- Trade-off: ad-supported, and no real physical mission beyond walking to a QR code.
AMdroid — best for unusual dismissals
5M+ downloads · 4.3 stars · free with ads + Premium
AMdroid has the most varied ways to stop an alarm: maths, CAPTCHA, connecting to a specific Wi-Fi network, tapping an NFC tag, scanning a barcode, or detecting light. An NFC tag stuck to the kettle is one of the most effective get-out-of-bed tricks available, because the alarm cannot stop until you are physically in the kitchen.
- Best for: tinkerers who want a hardware-based dismissal.
- Trade-off: smaller user base, lowest rating in this table, ad-supported.
Sleep as Android — best if you want sleep tracking
10M+ downloads · 4.6 stars · 7-day trial then freemium
A sleep tracker first, an alarm second. It tracks sleep with the phone’s sensors or a wearable, wakes you during a lighter phase within a window you set, and offers CAPTCHA tasks to dismiss. Integrates with Spotify, Wear OS and smart lights.
- Best for: people who want to understand their sleep, not just survive the morning.
- Trade-off: deep and settings-heavy. The listing shows in-app purchases up to $75.
Arisely — the camera-verified push-up mission
100+ downloads · not yet rated · free with one banner ad + Pro
Being straight about this: Arisely is new. It has 100+ downloads and no aggregate rating, against Alarmy’s 50M and 4.7 stars. If you want a proven app, pick one of the four above. We make it, so treat this section accordingly.
What it has that the others don’t is an AI push-up mission: you set a rep count, and the camera counts reps and checks form in real time, so the alarm keeps ringing until the set is done. It also chains missions — maths, then a barcode, then push-ups, each with its own difficulty — which is considerably harder to beat half-asleep than any single task. Two optional guards close the usual dodges while the alarm rings: one snaps the volume back up if you turn it down, the other blocks the power-off menu.
It needs no account, and alarms, settings and the sleep log stay on the phone. The free version shows one banner on the Alarms, Sleep and Settings tabs — never on the ring screen or during a mission.
- Best for: heavy sleepers who specifically want a physical, verified wake-up task, and who don’t mind a new app.
- Trade-off: new, few users, no sleep-cycle tracking, and the free tier has a banner ad. Mission chaining is a Pro feature.
Google Clock — when you don’t need any of this
1B+ downloads · 3.9 stars · free, no ads
Pre-installed, reliable, ad-free — and one tap to dismiss. If a normal alarm wakes you, you don’t need any app on this page. This guide is for people for whom it doesn’t.
How to choose
| Your situation | Pick |
|---|---|
| You want one proven app and no further thought | Alarmy |
| You want free puzzles from a large, established app | Alarm Clock Xtreme |
| You want to dismiss with an NFC tag or Wi-Fi | AMdroid |
| You want sleep tracking as well as waking | Sleep as Android |
| You want a camera-verified physical mission | Arisely |
| You dismiss and fall back asleep | Any app with Wake Up Check or a chained mission |
| A normal alarm already wakes you | Google Clock |
The pattern worth internalising: maths wakes your brain for ten seconds; walking to the kitchen wakes your body. If you have beaten puzzle alarms before by solving them in your sleep, go straight to a physical mission.
Before you blame the app
A large share of “my alarm didn’t wake me” cases are not about the app at all — the alarm never fired properly. On Android 12 and later, exact alarm permissions and manufacturer battery optimisation on Samsung, Xiaomi and OnePlus can delay or kill an alarm in the background.
If your alarms have ever been silent or late, fix that first: our guide to why Android alarms don’t go off covers the exact alarm permission and the per-manufacturer battery settings. No mission helps an alarm that never rang.
Related: Best Alarmy alternatives compared · The alarm app that makes you do push-ups · Why your Android alarm doesn’t go off