"Rus tilini qismlarga bolib o" is a free Android application developed by Mansur Gulomov, designed to help users learn the basics of the Russian language. The app offers 50% essential Russian language rules and 50% exercises to practice them.

The app's interface is straightforward and easy to navigate. However, the app contains ads, and the audio and image files make it a bit bulky. Additionally, when navigating between sections, users may experience some lag, and the audio may sometimes stop working altogether, requiring them to exit and restart the app.

Overall, "Rus tilini qismlarga bolib o" is a useful app for beginners who want to learn the basics of the Russian language. The app is free, and despite some technical issues, it offers a decent learning experience.