Otso is an Android application that allows you to access digital content included in books. Developed by Kustannusosakeyhtiö Otava, it falls under the category of Education & Reference. The app is free to use and is compatible with Android 9.0.

With Otso, you can watch and listen to videos, audio files and other digital content included in the book. The application has a simple interface, making it easy to navigate through the content. The app is designed to provide an enhanced reading experience for users.

The video and audio quality of the content is good, and the app supports a wide range of file formats. Overall, Otso is a useful tool for anyone who wants to access digital content included in books.