Tell me about some free parental control app that cannot be deleted exists?

Technical Overview: Preventing Parental App Removal on Android

Architecture of Deletion Prevention

Android provides several system level mechanisms that applications can use to resist uninstallation by standard users.

Device Policy Controller (DPC)

Applications that register as a Device Policy Controller through the DevicePolicyManager API gain elevated system privileges. When active, the Android package manager blocks standard uninstallation requests for the registered application. User must first deactivate device admin before removal is possible. This requires navigating to:
Settings > Security > Device Admin Apps > [App Name] > Deactivate

Profile Owner and Device Owner Modes

For MDM grade protection, an app set as Profile Owner or Device Owner cannot be uninstalled through any user facing method. This is the same mechanism used in enterprise environments. Setup typically requires ADB commands or a provisioning QR code during device first boot.

Factory Reset Protection (FRP)

When a Google account is bound to the device before child setup, any factory reset attempt will require that Google account credentials on next boot. This closes the nuclear option of a full device wipe.

Recommended Stack for Maximum Retention

  1. Bind device to parent Google account
  2. Enable Family Link with device admin
  3. Disable Developer Options in settings
  4. Set a strong screen lock the child does not know

This four layer configuration makes removal practically impossible for a child without physical access to parent credentials. No special hardware required. All features available in stock Android :wrench: