CK-12 FlexBook 2.0 vs Kotobee Author

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.

Kotobee Author creates and edits interactive ebooks, with tools for importing existing PDF, HTML, Word, and EPUB files and adding interactive material. Ebooks can include video, audio, image click animations, self-assessment questions, and book widgets. AI tools can generate text, images, questions, and voice narration. For educational content, authors can add auto-graded questions, track learner scores, and connect to an organization’s learning management system through SCORM, LTI, or Tin Can. The product exports to more than 12 ebook formats, including mobile apps; listed formats include EPUB, MOBI, PDF, and Word. Users can customize ebook-app branding with their colors and logo and remove Kotobee references. HTML, CSS, and JavaScript can be added for custom functions and integrations. Kotobee says exported files belong to customers and do not collect data from their users, though formats that depend on Kotobee servers require an active subscription. Kotobee Author runs on Android, iOS, Linux, macOS, web, and Windows. A free plan is available; paid plans are noted as starting from $150.