Orthodox Christian Calendar is a free iPhone app developed by Alexey Smirnov. This app falls under the category of Education & Reference and serves as a comprehensive tool for Russian Orthodox Christians. It provides a detailed schedule of fasting, Gospel reading, and other important information according to the Russian Orthodox Church calendar.

The standout feature of the app is its home screen widget, which displays the monthly calendar at a glance. This allows users to easily keep track of important dates and events.

In addition to the calendar, the app also offers a wide range of texts, including daily prayers (morning, evening, and throughout the day), the Divine Liturgy and related texts, and other prayers. The inclusion of the complete text of the Bible further enhances the app's usefulness for devout Orthodox Christians.

Orthodox Christian Calendar is a valuable resource for those who follow the Russian Orthodox Church calendar. With its user-friendly interface and comprehensive content, it offers a convenient way to stay connected to the traditions and rituals of the faith.