this post was submitted on 08 Jun 2024
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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.

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[–] [email protected] 10 points 5 months ago (1 children)

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.

[–] [email protected] 3 points 4 months ago (1 children)

I use it too and I like it, but OP needs to keep in mind that the apps that rely on Google Play Services will still have "Internet access" directly with it and Netguard can't do anything about it. WhatsApp for example: you can block Internet access to the apps, but it will still be able to send/receive messages.

[–] [email protected] 1 points 4 months ago

Came here to say NetGuard, too.

I did the allowlist approach and first blocked all and everything and then fiddled with the permissions and now have a good set of settings for stock Android. It’s doable within a few days while regularly using the devices and then allowing things as soon as you notice something does not work as expected.