NetGuard for android. It’s available on google play and as a standalone apk that you can download from github. It can see all the url requests your apps are making. You can block an app entirely from the internet, or you can go through and manually block all the ad and tracking requests. You can also block apps from using data which is great if you don’t have too much per month. You need to pay a small one time fee to unlock all the features though.