It doesn’t hurt to be aware of the times when apps send data (for example, to the headquarters of the makers).
With GlassWire you can see when data is sent. The app can, among other things, show the data in a graph and notify you when a specific app sends data. You can also request an overview of past consumption via the history function.
If you do not agree with a connection to the outside, you can directly block access for an app. You can use the basic functions of the software free of charge, but to access the full functions (including a full firewall), a contribution is requested.
The notification function is handy, which informs you when a new app connects to the outside world for the first time. The makers of GlassWire indicate that the app itself does not send data via the WiFi or mobile connection. The latest version also includes a widget, which gives you quick access to the app.
GlassWire, glasswire.com
Price: Free (includes in-app purchases)
System requirements: Android 6.0
Language: English