Буквица Русов is an Android application designed for people who are studying the letter. The app aims to unify everything and is not suitable for those who are not familiar with the letter. Currently, the app is in its beta version and is under active development. The developer, РаѕɣміР, plans to add more functionality to the app in the future.

The app provides a simple and easy-to-use interface for studying letter. It offers basic features such as letter recognition and pronunciation. It also includes a quiz section to test the user's knowledge of the letter. However, the app lacks advanced features like writing exercises and games, which could make the learning experience more engaging.

Overall, Буквица Русов is a decent app for those who want to learn the letter. However, it is still in its early stages of development and needs more features to improve its functionality.