Ukraiński - Ucz się języka is a free mobile application that helps users learn the Ukrainian language. It is developed by Tweeba and can be used on Android devices. The app offers various features, including Ukrainian vocabulary, grammar, tests, and a dictionary with essential topics.

The app's content covers a wide range of topics, including basic Ukrainian language greetings, vocabulary, and numbers, as well as more advanced topics like Ukrainian for school, work, business, tourism, and emigration. The app also includes two widgets for learning Ukrainian, "Word of the Day in Ukrainian" and "Ukrainian Dictionary."

Ukraiński - Ucz się języka is user-friendly and offers a comprehensive learning experience. The app can be used as a mobile flashcard tool or as a handy Ukrainian language textbook. The app also features a voice reader for Ukrainian words and phrases. It can be used both online and offline, and voice data files download simultaneously with the app.

Overall, Ukraiński - Ucz się języka is an excellent tool for anyone who wants to learn Ukrainian for free. It is easy to use, offers a comprehensive curriculum, and is available offline.