App Lock vs Vault: Locking an App Does Not Encrypt Its Data
An app lock asks for a PIN, pattern or biometric before an app opens. A vault stores your files in a protected place and, in a good one, encrypts them. A lock decides who can open the app. Encryption decides who can read the stored data. A lock by itself does not add encryption.
Phone steps follow Apple and Google help pages, and menu names differ by version. Mac steps use macOS 14 and later names.
Two different jobs
| App lock | Vault | |
|---|---|---|
| What it controls | Who can open an app | Where chosen files are kept and who can read them |
| What it protects | The way in | The files themselves, if the vault encrypts them |
| If the lock is bypassed | The data is as the app stored it | Encrypted files stay unreadable without the key |
| Typical use | Stop a person opening one app, such as messages or photos | Keep private photos, videos and documents apart |
What Apple and Google offer
iPhone: lock or hide an app
Touch and hold the app icon and tap Require Face ID (or Touch ID or Passcode), then authenticate. To hide the app, tap Hide and Require Face ID, authenticate, then tap Hide App. Apple lists these facts:
- Information inside a locked app will not appear in some places, such as notification previews, search, Siri suggestions and call history.
- A hidden app moves to the Hidden folder at the bottom of App Library. It is still visible in other places, such as Screen Time and App Store purchase history.
- Apps that come with iPhone, such as Calculator, Camera and Settings, cannot be locked. Only separately downloaded apps can be hidden.
- The locked or hidden status does not sync with iCloud.
Apple's page describes a lock and a hide. It does not describe an extra encrypted store for the app's data.
Android: Private space
Android 15 and later have a private space, set up under Settings > Security & privacy > Private space. Google says its apps are hidden from the launcher, recent views and quick search while it is locked, and that it cannot fully hide its own existence. It is not included in device backups. If you forget the unlock factor, you cannot access the space.
Why "applock vault" apps blur the line
Some apps lock other apps and also include a media vault. Names such as applock gallery vault, app lock privacy vault and vault app lock describe this mix. It is two features in one package, so judge each on its own.
In general, a lock that sits in front of another app does not change how that app stores its data. The files stay where the other app put them. A media vault is different: you hand it files, it keeps its own copy, and what protects them is the vault's own storage.
Where a lock helps and where it does not
- It helps when a friend or child borrows your unlocked phone and taps around inside one app.
- It does not help against anyone who knows your device passcode. Apple says a locked app opens with Face ID, Touch ID or your passcode.
- It does not help if the same photos also sit in your gallery, a cloud library or a chat you sent them in.
- It does not help if someone copies the stored data and reads it outside the app.
Which one do you need?
| Your goal | What fits |
|---|---|
| Stop someone opening one app on your unlocked phone | An app lock |
| Keep photos and files unreadable even if someone unlocks your device | A vault that encrypts, such as the ones in what a vault app is |
| Keep a lost device unreadable | A strong device passcode or password, and on a Mac, FileVault |
| Hide that an app exists | Hide an app on iPhone, or Private space on Android. Both leave traces |
On a Mac there are three layers. The login window and screen lock keep people out of your session. FileVault encrypts the disk. A vault protects chosen files inside your session. For why a Locked checkbox is not privacy, read lock a folder on Mac.
Questions to ask any app that says "lock"
- Does the developer say the files are encrypted, and with what?
- Where is the key kept, and can a reset restore access?
- Can you open the app's files some other way, such as in Files or Finder?
- Does the app back up, and where?
On a Mac you can check the third question yourself with the hands-on vault test. Disguised apps raise the same questions; see calculator vault apps.
Frequently asked questions
What is the difference between an app lock and a vault?
An app lock controls who can open an app. A vault stores chosen files in a protected place and, in a good one, encrypts them.
Does an app lock encrypt my data?
Not by itself. A lock controls access to the app. Check whether the app or device says the stored data is encrypted.
Can I lock an app on iPhone without another app?
On recent iOS versions, yes. Touch and hold the icon and choose the Require Face ID option, as Apple describes.
Can I lock apps on Android?
Android 15 and later have Private space, which hides apps behind a lock. Phone makers add other tools, so check your phone maker's help page.
Is a vault better than an app lock?
They do different jobs. Use a lock to stop someone opening an app. Use a vault to keep files unreadable.
Do I need both?
If you want to stop casual opening and also protect the files themselves, yes.
References
Your files. Your Mac. Locked.
Coming soon. Join the waitlist and we email the link.
Get early access