Arttu is a free Android application developed by Sanoma Pro Oy that allows users to access digital content related to their printed textbooks. The app uses the device camera to identify pages in the book that contain digital content such as videos, audio, 3D animations, and online content.

To use Arttu, simply open the app and allow it to access the device camera. Then, select the desired book from the My Books menu by clicking on the plus button. The app will automatically identify the pages in the book that contain digital content. From there, users can easily access the selected content by clicking on the button that appears on the screen.

The app's interface is intuitive and easy to navigate, making it simple for users to find the content they need. Arttu requires Android 6.0 or later to operate. Sanoma Pro Oy encourages users to report any problems they encounter while using the app using its feedback feature.

Overall, Arttu is a useful tool for students and educators who want to supplement their learning experience with digital content. Its simple interface and easy-to-use features make it a valuable addition to any student's toolkit.