CK-12 FlexBook 2.0 vs IXL Math

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.

IXL Math is an online and mobile math learning service covering pre-K through Calculus, with thousands of interactive skills. It recommends practice for each learner and adjusts practice to the learner’s level. The service includes video tutorials, interactive lessons, real-time feedback and awards. IXL Analytics provides real-time data about usage, trouble spots and student performance, and skills align with the Common Core State Standards and state standards. Without an account, users can practice ten free questions in each subject per day; IXL also offers a free 30-day classroom trial. Family memberships include one-child options at $9.95 a month or $79 a year, each with unlimited access to school levels, interactive exercises and real-time statistics. A classroom license costs $369 a year, with 25 students in the purchase summary and up to 100 student accounts. Integrations include Canvas, Schoology and Brightspace, with single sign-on and roster matching, plus a Google Classroom add-on. Apps are available for Android and iOS, as well as the web.