Апостол is an Android application developed by Simple Software Studio that offers a comprehensive collection of apostolic texts in Synodal Russian and Church Slavonic. The app contains the Acts of the Apostles, the Epistles of the Apostles, and the General Epistles of James, Peter, John, and Jude. Additionally, it includes the letters of the Apostle Paul to the Romans, Corinthians, Galatians, Ephesians, Philippians, Colossians, Thessalonians, Timothy, Titus, Philemon, and Hebrews.

One of the app's best features is the ability to adjust the font size for comfortable reading. Additionally, the reading mode prevents the screen from turning off, making it easier to read for extended periods. The app doesn't contain any advertisements and doesn't require an internet connection to use. Overall, Апостол is an excellent reference app for anyone interested in studying the apostolic texts.