NetProtector Firewall: Block is a free Android application developed by ByteCode Inc. that provides a simple and advanced way to block access to the internet without requiring root access. This personalization app allows users to individually allow or deny access to applications and addresses on their Wi-Fi and/or mobile connection.

The app is designed to help users reduce data usage, save battery life, and increase privacy. With NetProtector Firewall: Block, users can block access to the internet per application, which prevents unknown incoming internet data access. The app is actively developed and supported, and it supports Android 5.1 and later versions.

NetProtector Firewall: Block is a 100% open-source app with no tracking or analytics. It also offers optional features such as allowing access when the screen is on, blocking when roaming, and blocking system applications. The app has a material design theme with light and dark themes, and it is a compact size application with a clean and friendly user interface.

Overall, NetProtector Firewall: Block is a great app for those who want to increase their privacy and control their data usage.