N.A.Bible is an Android-based application that provides an offline version of the New American Bible. The app is developed by mRobot and is free to use. It is a lifestyle app that doesn't require any internet connection to access the Bible. The app is based on the latest version of the Vatican, and all the advertising is only on the covers and not in the books.

This app is considered unofficial, and the developer has no relations with the Vatican. The New American Bible can be downloaded from the Vatican's website, and the app provides access to other formats of the Bible, such as NASB, FB2, EPUB, MOBI, and more. The app's interface is simple and user-friendly, making it easy to navigate and read the Bible.

Overall, N.A.Bible is a great app for people who want to read the Bible offline and prefer the New American Bible version. The app is free, and users can access the Bible without the need for an internet connection. However, it's important to note that the app is unofficial and has no affiliation with the Vatican.