CK-12 FlexBook 2.0 vs EL Education Curriculum

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.

EL Education Curriculum is a free, web-based K–8 Language Arts curriculum for educators and schools. It is standards-aligned and includes teacher tools and built-in assessments. The design draws on the science of reading and the science of learning and development. Students use complex, grade-level texts by diverse authors while building science and social studies knowledge. Original research and interdisciplinary investigations develop inquiry, analysis, critical thinking, and craftsmanship. Differentiated opportunities address English language learners, economically disadvantaged students, students with disabilities, and advanced learners. Connections to students’ communities support compassionate leadership and thoughtful citizenship. Grade-level index pages provide downloads such as Teacher’s Guide PDFs and Teacher Supporting Materials or Student Workbook Word documents. Creating an account provides access to hundreds of free resources. EL Education offers coaching and strategic planning for guided curriculum pilots. The digital resources plan costs nothing; some resources require an account. A 2025 K–5 professional learning course costs $350, paid once and provides 365-day access.