Liber Pro is described as 'Digital edition of a 2,300-page liturgical chant book for Apple devices, featuring calendar-based navigation, annotation tools, bookmarks, search, dark mode, and offline access' and is an app in the education & reference category. There are four alternatives to Liber Pro for a variety of platforms, including iPhone, iPad, Android, Google Chrome and Kindle Fire apps. The best Liber Pro alternative is Chant Tools, which is both free and Open Source. Other great apps like Liber Pro are Breviarium Meum, Universalis and Evangelizo.
It is mostly intended to be useful for containing the Gregorian Mass propers as well as the Gregorian Mass ordinaries as found in the Liber Usualis, and transcribed on GregoBase (http://gregobase.selapa.net) and there may be some mistakes in the chant.
Breviarium Meum allows you to pray the traditional (1962) Latin breviary of the Catholic Church wherever you go (if you have an iPad, download Breviarium Meum HD instead). You can download the texts up to a week in advance, so you can pray even when you don't have a network...
Universalis Publishing was started in 1995 with the aim of harnessing computer technology to help in enriching the spiritual life of Christians, specifically by making the liturgical and devotional resources of the Catholic Church available on the new electronic media.
Catholic service: Daily Gospel, the gospel, the readings, the saints, the prayers, in 10 languages : French, English, Portuguese, Spanish, Dutch, German, Arabic, Italian, Polish, Armenian.
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