Mobile Prayer Book is a free multilingual Catholic prayer book available on Android. It offers prayers in English, Latin, Español, Français, Italiano, Polski, Português, 简体中文, 繁體中文, български, Беларуская, Українська, and Русский. The app includes a rich set of prayers and elements of the Catechism.

The app developer, creocode.com, encourages everyone to pray for this project, so that everyone can have access to a free prayer book in their language. The developer also invites users to contact them for details on how to help translate the prayer set into other languages. The app is also available on other platforms, and users can find more apps on the developer's website.