What it means
Locking an app requires Face ID, Touch ID or a passcode when opening it. Hiding an eligible app adds the lock and moves it to a protected Hidden folder, removing it from normal Home Screen and search surfaces. Neither setting syncs its locked state to other devices.
A real-world example
A banking app remains visible but locked, while a downloaded journal app moves to Hidden. Both still exist and can be opened by the phone owner after authentication.
What to do
Choose lock for access control with a visible icon; choose hide when casual visibility matters too. Test reopening the app and check other devices separately.
The distinction that matters
Hiding is not uninstalling, account deletion or a way to erase a service's data. Apple lists built-in and default-app limits, plus Family Sharing conditions that can affect which apps may be hidden.
Apple's lock and hide definitions
