Digital library appALTER the reader, which can run ALTER textbook publishing on tablets. App-textbooks correspond to the extent and structure of printed titles. Selected titles also contain interactive elements. App-textbooks are suitable for school teaching and pupils' homework.

Application features:
 - Intuitive user-friendly operation
 - Easy orientation in a publication
 - Easy browsing and active content
 - Zooming
 - Remembering your reading chapters / pages

Further functions for selected films:
 - Supplementing omissions from the menu
 - Correspondence responses
 - Evaluating the correctness of the solution (feedback)
 - The repair of wrong solutions
 - Songs and spoken texts
 - Image and text attachments

Library appALTER:
 - Download publications available from the server
 - Sorting books by keywords
 - My Books