Privacy policy

Firewall by Zanoshky. Last updated March 2026.

This app collects nothing. Zero. Nada.

Details

Firewall (“the App”) does not collect, store, transmit, or share any personal data or user information of any kind.

No analytics
No crash reporting
No telemetry
No advertising SDKs
No third-party services
No network calls to external servers
No user accounts

The App creates a local VPN service on your device to filter network traffic. All processing happens entirely on your device. No traffic is routed to, inspected by, or forwarded to external servers.

Your firewall rules for each app are stored in a local database on the device (Room/SQLite). This data never leaves your device.

Permissions

VPN Service: Creates a local VPN for on-device traffic filtering. No data is sent externally.
Query All Packages: Displays the list of installed apps so you can set a firewall rule for each one.
Internet: Required for the local VPN tunnel mechanism to function.
Boot Completed: Restarts the firewall after device reboot if it was previously enabled.
Foreground Service: Keeps the firewall running reliably in the background.
Post Notifications: Shows a persistent notification when the firewall is active (Android 13+).

Open source

This app is fully open source. You can audit every line of code yourself at github.com/Zanoshky/android-firewall.

Contact

Marko Zanoški, marko@zanoski.com
github.com/Zanoshky/android-firewall