Most iPhone Users Don't Know iOS 18 Can Lock Any App With Face ID
No password managers, no Screen Time hacks. iOS 18 quietly added a native way to lock Notes, Photos, or almost any app behind Face ID—straight from the Home Screen.
01. What It Is
For years, keeping a nosy friend out of your Notes or Photos meant juggling third-party vaults, clunky Screen Time restrictions, or hiding apps in obscure folders. iOS 18 made all of that unnecessary. Apple built app locking directly into the operating system, and it works from the same long-press menu you already use every day.
When you lock an app, opening it requires Face ID (or Touch ID on compatible devices, or your passcode as a fallback). But it goes further than just blocking the launch: a locked app's content disappears from notifications, Spotlight search, CarPlay, Siri suggestions, and even call history. Someone glancing at your phone won't see previews, snippets, or any trace of what's inside.
This isn't a repurposed Screen Time trick—it's a distinct, system-level security feature. It works on virtually every third-party app and on many of Apple's own, including Notes and Photos. A handful of core system apps are excluded, but for the private stuff most people actually worry about, it's exactly what you'd want.
Why It Matters
You get real, built-in privacy without paying for a password manager or fiddling with restrictions. Handing your phone to a kid, a coworker, or a stranger to snap a photo no longer risks exposing your messages, notes, or private albums. It takes about five seconds to set up per app and costs nothing.
Who Can Benefit
- Anyone who hands their phone to friends or family and wants to keep certain apps private
- People storing sensitive notes, journals, or personal photos
- Users who dislike third-party vault apps and monthly subscriptions
- Professionals who need to protect client info or work apps on a personal device
02. Step-by-Step Guide
- 1
Update to iOS 18 or later
Go to Settings → General → Software Update and make sure you're running iOS 18 or newer. The app lock feature does not exist on earlier versions.
- 2
Long-press the app icon
On your Home Screen (or in the App Library), touch and hold the icon of the app you want to protect until the context menu appears.
- 3
Tap 'Require Face ID'
Select 'Require Face ID' from the menu (it will say Touch ID on devices with a fingerprint sensor). Confirm with a Face ID scan to activate the lock.
- 4
Optionally hide the app entirely
Instead of just locking, choose 'Hide and Require Face ID' to move the app into a hidden folder in the App Library. It won't appear on your Home Screen and can only be opened after authenticating.
- 5
Test it
Close the app and reopen it. You should be prompted for Face ID, Touch ID, or your passcode before the content loads.
Pro Tips
- Locking Notes and Photos is especially useful—these are two of the most personal apps and now fully lockable.
- Use 'Hide and Require Face ID' for apps you don't want anyone to even know are installed; they vanish from the Home Screen into the App Library.
- Locked apps stop leaking previews into notifications and Spotlight, so it's also a great anti-shoulder-surfing move.
- Combine it with a strong device passcode, since the passcode is the ultimate fallback that unlocks any locked app.
Warnings & Limitations
- Requires iOS 18. Older iPhones and older OS versions don't have this feature.
- Anyone who knows your device passcode can unlock your locked apps—the passcode is always a valid fallback.
- Some core system apps cannot be locked: Calculator, Camera, Clock, Contacts, Find My, Maps, Shortcuts, and Settings.
- Lock status is device-specific and does NOT sync via iCloud. You must set it up separately on each iPhone or iPad.
- Family Sharing limits apply: children under 13 cannot lock or hide apps, and teens 13–17 can lock apps but parents can still see usage via Screen Time.
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