N Navbar - Substratum is a personalization app developed by Varefaz for Android devices. It offers a wide range of navigation bars that users can choose from to customize their device's interface. The app is free to use and requires Substratum Theme Engine to work.

To use N Navbar, users must have an Android device that runs on Android 6.x or higher. However, users should note that the animation feature does not work for Android 6.x, and it can only be hidden for Android 7.x. The app is not compatible with Android 10+. N Navbar is compatible with OMS ROMs and has limited support for Custom (RRO) ROMs, CM/LINEAGE Based ROMs, and Stock ROMs (RRO).

N Navbar offers various types of navigation bars, including DarkGray, LightGray, Marshmallow style, Nougat style, Standard Home button, and Pixel navbar Home button. The app provides easy installation instructions, which involve opening the Substratum Theme Engine, selecting the preferred navigation bar, and rebooting the device if using Sub. Legacy.

Overall, N Navbar - Substratum is a useful app for users who want to personalize the interface of their Android device and offers a wide range of navigation bar options to choose from.