Православный календарь is an educational and reference app developed by Russian Language Center Limited. It serves as a comprehensive Orthodox calendar and library, providing users with access to a wide range of religious resources and information.

The calendar feature offers four different views: daily, weekly, monthly, and yearly. Users can explore icons and daily readings from the Gospels. Additionally, the app includes troparia and kondakia for the twelve major holidays, as well as saints and weekly troparia and kondakia (with audio).

Users can set reminders for holidays and access a widget called "Overview for Today" for quick reference. The app also allows users to customize the fasting level and background color.

In addition to the calendar, the app offers a library of religious texts. Users can access the Old and New Testaments in both Russian and Church Slavonic languages. The library also includes prayer books, canons, and akathists. Users can explore the texts of Vespers and Divine Liturgy with commentaries, as well as sermons on the Divine Liturgy by St. Serafim (Zvezdinsky). The app also includes the Sunday prayer book for laypeople and a collection of synaxaria for the Lenten and Triodion periods.

Furthermore, the app integrates with the "Lives of the Saints for Every Day" app, providing users with a comprehensive spiritual resource.

Православный календарь is a free app available on the iPhone platform. It offers a wealth of religious information and resources, making it a valuable tool for Orthodox Christians seeking to deepen their faith and understanding.