I’m asking for Android specifically, but I’m curious what else is out there.

For example, some apps work without internet but may use it if it’s available. I might want to block that without having to turn off wifi, force stopping it, and wiping the cache/data.

Similarly, maybe I only want to use the app over a VPN and want to prevent accidentally opening it without first turning the VPN on.

  •  englislanguage   ( @englislanguage@lemmy.sdf.org ) English
    9•4 months ago

    Netguard is a FOSS Android app which kinda works like a firewall. You can allow/block network access on a per-application basis. You can limit access e.g. on WiFi or on mobile etc. It also supports blocklists, supplementing your ad blocker.

    To the Android OS, Netguard acts as if it were a VPN.

    Limitations:

    • if you want to filter Android system services, you will break things. You will need to spend some time to do it right.
    • Chaining it to another VPN is only possible via SOCKS proxy
    • if you want to route some app’s traffic via VPN and others not, I think that is not possible. You could, however, manually turn off an app’s internet connection before disconnecting the VPN, if that is not too error-prone for you.

    The app is very stable, I have been using it for about 5 years without problems. For most use cases it is fire-and-forget, i.e. I rarely open the app any more.