ReadingIQ is a digital library app from Age of Learning (the creators of ABC Mouse). It features over 7,000 digital books for a wide range of reading levels. Students' libraries auto-populate with books based on their indicated reading levels. There are picture books, chapter books, beginning reader books, books with no words, and books with no pictures. All books are classified according to grade and/or Lexile level as well as category such as Adventure and Mystery, Earth and Space, or The World of Work. Books in the Show What You Know category have a short comprehension quiz at the end. - Commonsense.org