Kurs: Rus tili darslari is an Android application developed by Планета знаний that offers 30 lessons to learn Russian. The lessons are available in both Uzbek and Russian languages and cover grammar, tests, and vocabulary. Each lesson allows users to test their knowledge.

In addition to the lessons, the app also includes a section with Russian proverbs, tests, and a Russian-Uzbek phrasebook called "Сўзлашув 505-та гап". The app features a modern design, dark mode, and can be used offline for free.

The lessons cover topics such as greetings, family, work, transportation, weather, and more. The app also includes tests for migrant workers.

Overall, Kurs: Rus tili darslari is a useful and free app for those who want to learn Russian and improve their language skills.