Polylino is an easy-to-use app for children and offers access to over 1,700 children's books for reading, reading aloud or listening to - for families, but also for educational institutions. In addition to the German picture book texts, the app also offers an audio read-aloud function for each book, not only in German, but for many books in over 70 languages. 18 books are also available in sign language. Polylino currently contains books from over 60 publishers.

The City of Bonn has acquired a comprehensive license agreement for the Polylino app. This means that all children in Bonn will be able to use Polylino at home free of charge from 2025. In addition, all educational institutions in the city of Bonn can have institutional access to the Polylino app set up.