App Lock on Realme phones is a security layer that sits between the regular screen lock and the apps themselves. Once activated for an app, that app asks for a separate PIN, pattern or biometric check every time it is opened, even if the phone is already unlocked.
What problem does App Lock solve?
A normal screen lock protects the whole device, but once unlocked, anyone holding the phone can open every app. App Lock closes that gap for individual apps that hold sensitive content: banking apps, messengers, galleries or notes with private information.
It is useful when you hand your phone to a child for a game, when a colleague borrows it for a call, or simply when you want an extra checkpoint before anyone can read your chats.
How the protection works
App Lock is managed centrally in the security settings and lets you select which installed apps require verification. Verification usually happens the same way you unlock the phone: fingerprint, face recognition, or a dedicated PIN and pattern set specifically for App Lock.
Because the check happens app by app, you can leave low-risk apps open for quick access while locking down email, payment apps or private galleries.
What App Lock does not do
App Lock protects access to an app's interface, not the data itself while the phone is fully unlocked and the app is already open in the background. Force-closing or clearing an app from recent apps and reopening it will trigger the lock again, but switching quickly between an already-open locked app and another app usually does not.
Some system apps, such as core dialer or settings components, may not appear in the list of lockable apps, since restricting them could interfere with basic phone functions.
App Lock and notifications
Locking an app controls who can open it, but incoming notifications can still show message previews on the lock screen unless notification content is separately hidden in the notification settings for that app. For full privacy, combine App Lock with hidden notification previews on apps you consider sensitive.
Practical tips
Use a PIN or pattern for App Lock that differs from your main screen lock PIN, so a person who sees you unlock the phone cannot automatically open protected apps too.
Review the list of locked apps occasionally. Apps get reinstalled or updated, and a fresh installation may reset its lock status, so a quick check keeps sensitive apps consistently protected.
If fingerprint or face recognition fails repeatedly, the PIN or pattern set for App Lock always works as a fallback, so choose one you can recall reliably without writing it down.