FlexBook® textbooks are CK-12's open source digital textbooks.
They are:
- free and fully customizable
- focused on science, technology, engineering, and mathematics (STEM)
- aligned with state and Common Core standards
With FlexBook® textbooks, you can:
- read, download, and customize
- view online
- read on an iPad or Android device
- author from scratch
- edit our books, build upon them, and share with students
- add or remove images, videos, web links, and animations (either your own, or from the web)
- share books through CK-12 Classes, Facebook, and Twitter