CK-12 FlexBook 2.0 vs Lumen Learning

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.

Lumen Learning develops digital courseware and faculty professional development resources for higher education. Its course materials replace textbooks with interactive text, video, simulations, practice questions, updated content, and mobile-friendly access. The catalog covers more than 50 subjects, with a focus on introductory, general education, and developmental courses. Lumen One offers personalized study plans, immediate feedback, student-faculty connection tools, a peer community, and teaching-practice tips. Courseware can be customized after delivery into Canvas, Blackboard Learn, D2L Brightspace, or Moodle and adjusted for different term lengths. Mobile access works through common browsers on iOS and Android without an app. Static courseware text and images are open educational resources. The course support fee is $35/term. Additional options include professional development priced per seat.