NetGuard. Creates a local VPN through which the internet is routed. Shows the domains each app is accessing, can be blocked per app, or forbid internet at system level (breaks things, require fine tuning).

Also you can configure a non standard DNS (like adguard, which can block some things at the DNS level).

EDIT: or NextDNS, since it comes with some additional features.

I use https://blokada.org/index.html on Android.

But you have to keep an eye on it because it can get killed when Android(?) thinks it needs the resources for something else. The app has some options to help prevent this but it doesn't always seem to work.

I used to use NoRoot Firewall [0], which worked similarly, and allowed you to block per-application.

[0] https://play.google.com/store/apps/details?id=app.greyshirts...

Not sure, but you can use something like NextDNS to achieve the same. It’s basically a “pihole in the cloud”:

https://kennis.cc/public_uploads/0caeb8d4.png

Android has tons of these apps. Cuz its Android. An app exists for everything.

Check out Blockada. (Non-root)

Adaway (root and non root phones)

Adaway requires version 5.something for non rooted devices. Anything less than version 4 is only for rooted devices.