Orthodox Calendar is a free iPhone app developed by David Leselidze. It falls under the category of Lifestyle and offers a comprehensive Orthodox calendar experience.

With this app, users can access the lives of the saints, icons, troparions, and kontakions. It also provides daily Scripture readings, allowing users to stay connected with their faith on a daily basis.

The app also includes information about feasts, fast days, and days of remembrance, providing a complete overview of the Orthodox calendar. It is worth noting that the app follows the Julian Version, also known as the "Old Calendar."

Overall, Orthodox Calendar is a valuable tool for individuals who follow the Orthodox faith, offering a convenient way to access important religious information on their iPhone.