CK-12 FlexBook 2.0 vs Sutori

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.

Sutori is a web-based timeline tool for K–12 history and social studies classrooms. Teachers and learners can build presentations from templates or a blank story, adding text, media, quizzes, and polls. Stories support real-time collaboration, with the creator able to invite unlimited collaborators, and can be converted into PowerPoint presentations. Sutori integrates with Google Classroom and Microsoft 365 and supports LTI-based learning systems including Blackboard, Canvas, D2L, PowerSchool, Moodle, and Schoology. Students entering through an integrated LMS receive accounts automatically. The free Sutori Essential plan costs nothing and permits unlimited presentations, but creation is limited to text and image items. New users get a 30-day Sutori Unlimited trial before moving to the free plan; educators can add 30 days by inviting three fellow educators. Unlimited and Pro subscriptions renew every 365 days. Sutori identifies the service as COPPA- and GDPR-compliant.