Български Православен Календар is a free Android app developed by Daniel Georgiev that provides a comprehensive guide to Bulgarian Orthodox traditions and holidays. The app is based on the book version of the Bulgarian Orthodox Calendar for the year 2023 from the Bulgarian Patriarchate.

The app offers a wealth of information about the Bulgarian Orthodox Church, including the history, beliefs, and practices of the church. It also includes a calendar of all the major holidays and feast days, along with detailed descriptions of each holiday and its significance. Users can easily navigate through the calendar to find information about specific dates, and the app includes a search function for easy access to specific topics.

Overall, Български Православен Календар is an informative and useful app for anyone interested in learning more about Bulgarian Orthodox traditions and holidays. However, it is important to note that the app encourages users to make a donation to the Bulgarian Orthodox Church or purchase the book version of the calendar, which may not be of interest to all users.