Catholic Doctrine - Offline is an Android app developed by PDTanks Tech, designed to provide an all-in-one source of information for Catholics. The app comprises three main sections: Bible, Latin Commons and Catholic Doctrine.

The Bible section includes the whole 73-book canon recognized by the Catholic Church, including the deuterocanonical books. This section offers a simultaneous read-highlight capability, making reading the Bible an enjoyable experience.

The Latin Commons section promotes the Latin language, which is adapted as the universal language of the Catholic Church. It enables both the clergy and laity to learn to speak the Latin mass order and common prayers. Repetitive use of this app's Latin Commons section is sure to guarantee fluency.

The Catholic Doctrine section covers the pertinent issues about the Catholic Church that Catholics need to understand to treasure their faith. The app summarizes major teachings of the Catholic Church discussed in the early councils of the Church in various creeds, including the Nicene Creed and the Apostles' Creed. The app also includes a number of catechisms that summarize the Church's teachings.

Catholic Answers and Apologetics is an additional feature of the app, which helps Catholics defend their faith and learn more about their Catholic beliefs. This app is a valuable resource for Catholics who want to deepen their faith and knowledge.