We make an alarm app, and this page is written to be useful even if you never install it. The free fixes come first, because for most people they are enough. Anything about sleep itself is sourced to published research or the NHS rather than to us, and linked at the bottom. Mornio is not a medical product and cannot diagnose or treat anything.
Short answer
Functionally identical: apps that support one usually support both, and neither is more secure.
Print a QR code if you want to choose the exact spot and never re-register. Use a household barcode if you want zero setup and prefer the target attached to something you already touch each morning. The strongest setup is usually one of each, in different rooms.
This decision matters less than people think, and the thing it is often confused with, where you put the target, matters much more. Still, there are real differences worth two minutes.
The practical differences
Printed QR code
Household barcode
Setup effort
Generate and print it
None, scan what you own
Choose the exact location
Yes, anywhere you can stick it
Limited to where the object lives
Runs out
Never
Yes, when the product is finished
Someone else moves it
Unlikely if stuck down
Common in shared kitchens
Scan speed
Fast, flat and high contrast
Slower on curved bottles
Survives a damp bathroom
Only if taped or laminated
Usually fine
Ties into your routine
Only where you place it
Attached to something you already use
When to print a QR code
You want the target in a specific spot with no suitable object there, like the back of a bedroom door.
You keep forgetting to re-register when a product runs out.
You share a kitchen and things get moved.
You want it to work identically for months with no maintenance.
Practical notes: print it large enough to scan quickly in poor light, tape or laminate it if it is going somewhere damp, and do not keep a copy of the image on the phone you are trying to get out of bed with.
When a household barcode is better
You want to be set up in sixty seconds with no printer.
You like the target being attached to something your morning already involves, like a kettle. That alignment is quietly doing work: the mission stops feeling like an artificial obstacle and starts being your routine.
You would rather not have a printed square taped to your bathroom mirror.
Choose something long-lived. A kettle, a soap dispenser or a tin you refill will outlast a toothpaste tube by years.
Use both
The setup that holds up best over months is a household barcode as your primary, in the room you actually want to be standing in, and a printed QR code as a backup in a different room. The barcode ties into your routine; the printed code covers the day the product runs out.
Mornio supports up to two backup items alongside the primary, so three codes total. Put them in different rooms rather than on the same shelf, since the failure you are covering is the primary being gone, not momentarily out of reach.
Does either one affect privacy?
Not in a well-built app, because neither is stored as a readable value. Mornio saves a salted one-way hash plus a label you choose, so nothing on the device reveals which product you scan or where it lives. That applies identically to printed codes and product barcodes. Other apps make different choices, so check the privacy policy if it matters to you.
Either one works. Pick where it lives.
Register a printed QR code or any household barcode, plus up to two backups.
Neither is more secure or more reliable in itself. A printed QR code lets you choose the exact location and never runs out, which is its main advantage. A household barcode needs no setup and is attached to something you already use each morning. Most apps that support one support both.
Do I need to print a QR code to use a scan alarm?
No. Mornio, Alarmy, SuperAlarm, Nuj and Alarm Scan all accept ordinary product barcodes, so you can register something you already own. Printing a code is only worth it when you want the target somewhere no suitable object lives, or you are tired of re-registering when products run out.
Can I use both a QR code and a barcode?
Yes, and it is the setup we would recommend. Use a household barcode as your primary in the room you want to end up in, and a printed QR code as a backup in a different room. Mornio allows up to two backups alongside the primary, giving three codes in total.
Where should I print and stick a QR code?
Somewhere you must walk to and where there is light, typically a bathroom mirror or cabinet door. Print it large enough to scan in poor morning light, and tape or laminate it if the room gets damp. Avoid anywhere within reach of the bed, which defeats the point entirely.
Mornio Privacy Policy, on what is stored on your iPhone and what is not stored at all.
Alarmy - Loud Alarm Clock, Delight Room Co., Ltd. App Store listing (price, ratings, compatibility, mission list and App Privacy labels).
SuperAlarm - Loud Alarm Clock, Jiseop Han. App Store listing (mission list, pricing tiers, compatibility and App Privacy labels).
App Store details change without notice. Everything above was checked on 21 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 21 July 2026.