This page cannot read your iPhone settings. No web page can, and any that claims to is not doing what it says. You confirm each item yourself; the counter just tracks what you have confirmed.
Work down the list before a morning you cannot afford to miss. Most people find two or three they had wrong, and the test alarm at the bottom is the one that actually proves it.
The checks
Nothing is saved and reloading clears it. Which items you tick stays in your browser; we count only that the checklist was finished.
Volume and sound
Will it fire at all
Things people worry about wrongly
The part that actually proves it
0 / 14
Fix these before you rely on it
Your alarm setup still has gaps. Work through the unticked items first — they cost nothing, and an app cannot compensate for an alarm that was never going to ring.
Your basic setup looks good
Everything here is about the alarm making noise. Mornio adds the next part: scan-to-stop across the room, and an awake check a few minutes later, for the mornings that are too important to miss.
Requires iOS 26.1 or later · free tier, no account
The three failures, in order of how often they happen
Almost every “my alarm didn't go off” is one of three things, and they need completely different fixes.
It never rang. Toggled off, wrong day, wrong am/pm, dead battery. Boring, common, and entirely preventable by the checks above.
It rang too quietly to wake you. Volume slider, soft surface, covered speaker, Bluetooth. Also preventable, and the one-minute test catches all of it.
It rang, you turned it off, and you went back to sleep. This is the big one, and nothing on this checklist helps with it.
If you have been through this list twice and the alarm demonstrably rings, you have failure three, not failure one. That is a different problem with a different answer: why you turn off your alarm without remembering.
Louder is usually the wrong fix
If you are switching the alarm off without remembering it, the alarm was already loud enough to rouse you. The failure happened after that, at the dismissal, and volume does nothing about it. Turning it up just makes the mornings you do wake up worse.
Volume only helps if you genuinely are not being woken at all, and in that case the more likely cause is sleep debt rather than decibels. More detail in how iPhone alarm volume works.
When this is worth raising with a doctor
Everything on this page assumes you are getting enough sleep and still struggling to wake. If you sleep a full night and still wake unrefreshed, feel sleepy during the day, or someone has told you that you snore loudly or stop breathing in your sleep, that is worth a GP appointment rather than another app. The NHS pages on excessive daytime sleepiness and sleep apnoea describe what to look for. Mornio is not a medical product and cannot diagnose or treat anything.
The night-before routine
For anything that genuinely matters, a flight, an exam, a first shift:
Run the one-minute test with the phone where it will actually be.
Put the phone on a hard surface, across the room.
Set the alarm the moment you know the time, not at midnight when you are exhausted.
If you are working a rota, use the wake-up time calculator so the alarm accounts for the commute and the grogginess.
Decide what happens after the alarm stops. Put something across the room that you have to interact with, like a printed QR code.
No, and nothing in a browser can. A web page has no access to your Sounds and Haptics settings, your alarms, your battery state or your Focus modes, and any page claiming to test them is not doing what it says. This is a checklist you confirm yourself, which is why every item tells you exactly where to look.
Why didn't my iPhone alarm go off?
In rough order of likelihood: the alarm was toggled off rather than on, the repeat days did not include the day you needed, the Ringtone and Alerts volume was low, the phone was face down on something soft, or the phone was dead. Silent mode is almost never the answer, because alarms are exempt from it.
Does silent mode stop iPhone alarms?
No. Silent mode silences the ringer and notifications, but alarms ring anyway, and that is by design. The same applies to Focus modes including Sleep Focus. If your alarm was quiet, look at the Ringtone and Alerts slider in Sounds and Haptics, or at what the phone was resting on.
Will my alarm ring if the phone is locked or the app is closed?
A system alarm rings regardless of the lock state, and regardless of whether the app that scheduled it is open. Apps that fake an alarm with a notification are the ones that behave less predictably, which is why it is worth knowing which kind you are relying on.
What is the one-minute test?
Set an alarm for one minute from now, put the phone exactly where it will be overnight, and let it ring all the way through without touching it. It catches volume problems, muffling, Bluetooth routing and permission problems in one go. Do it before the morning that matters, not after.
NHS, Sleep apnoea, on symptoms including waking unrefreshed, loud snoring and breathing that stops and starts.
App Store details change without notice. Everything above was checked on 30 July 2026 — if you spot something out of date, tell us at support@mornioapp.com and we’ll correct it. Written and published by the Mornio team. Last reviewed 30 July 2026.