Основа Знаний is a free educational app developed by TellStory for Android 9.0 users. This app offers a wide range of topics, from astronomy, physics, to history and more. It is perfect for those who want to learn new things or expand their knowledge on various subjects. The app is user-friendly and has an intuitive interface that makes it easy to navigate.

One of the best features of this app is the bookmarking system. Users can bookmark a page and resume reading at a later time, making it convenient for busy individuals. The app is also regularly updated with new content, ensuring that users will never run out of things to learn. Overall, Основа Знаний is a great app for anyone who wants to learn new things and expand their knowledge.