CK-12 FlexBook 2.0 vs Interactive Textbooks Digital Library

CK-12 FlexBook 2.0 provides customizable digital textbooks for K–12 subjects including science, math, and social studies. Lessons can combine text with PLIX interactives, simulations, adaptive practice, and related learning materials. Adaptive Practice draws questions from a library of more than 150,000 and adjusts selections based on student answers. Teachers can assign lessons, videos, interactives, and practice to whole classes or differentiated groups, then view progress reports. Educators can reorder chapters and edit or add content in customized FlexBooks. The service works in browsers on laptops, desktops, Chromebooks, tablets, and mobile devices, and is listed at free. Standalone Simulations and PLIX Interactives require a tablet-size screen or larger. Users may download PDFs of FlexBooks they create or customize, though interactive content may not render; CK-12-created PDFs are not downloadable. CK-12 says it is still converting all core content to FlexBook 2.0. Listed SSO or LMS partners include Google Classroom, Canvas, Schoology, Kiddom, Clever, and ClassLink.

Interactive Textbooks Digital Library is a free web and iOS repository for Greek schoolbooks and related educational material. It serves teachers, students, parents, guardians, and other interested users. Coverage spans primary school, gymnasium, general lyceum, and vocational lyceum (EPAL). Books are provided in PDF and HTML, with selected titles in interactive HTML, iBook, and low-vision formats. The library states that more than 160 interactive books include links to simulations, experiments, exercises, educational games, videos, maps, and visualizations from Photodentro repositories. Users can search keywords, including words inside book text, browse by class or subject, and filter by education level, class, book type, and subject. Some editions provide 18–38 point text. Materials can be copied, printed, downloaded, stored locally, and viewed on a computer. Course pages include descriptions, objectives, curricula, and grouped books, while guides support teachers and parents. The library is powered by DSpace and maintained with Ministry of Education funding.