Pravoslavni kalendar is an Android application developed by Solvus Lab that provides users with a comprehensive guide to the Orthodox Church calendar, including holidays, fasting periods, and patron saints' days. The app covers the period from 2010 to 2021 and offers daily date views according to both the Gregorian and Julian calendars, as well as moon phases and fasting types. Pravoslavni kalendar offers three calendar views: textual, icons of the saints, and graphic view of the fasting period, as well as a prayer book with more than fifty prayers. The app also includes an Easter date calculator for both Orthodox and Catholic Easter dates. Additionally, Pravoslavni kalendar offers four types of widgets (1x1, 2x1, 2x2, 4x1) for easy access to the calendar. The app automatically adjusts moveable holidays and fasts for every year according to Easter as well as the phases of the moon. The latest version (v2.0) includes an extended period of the church calendar, a new daily view, easier navigation, and the addition of previously missing patron saints' days.