Древнеславянская Буквица (Old Slavic Letter) is an Android application that provides children and their parents with an opportunity to learn about the ancient Slavic alphabet. The app features 49 letters and includes information about the history of the alphabet. The app is designed to help users understand how the Cyrillic alphabet came to be and how it was used to translate the Bible into the Slavic language.

The app also includes a calendar of Slavic holidays, where users can learn about the traditions associated with each holiday. The app is easy to use and provides a wealth of information about the ancient Slavic alphabet and its history. The app is free to use and contains no ads. All sources of information and graphic materials used in the app are properly cited, ensuring that users can trust the accuracy of the information provided.