CK-12 FlexBook 2.0
7.6#3 in digital textbook platformsFree planFree planAndroidiOSWebExtension
VisitCK-12 FlexBook 2.0 vs Lumen Learning
Lumen Learning
6.6#10 in open educational resource platforms$350 one-timeAndroidiOSWeb
VisitWhat both publish
| Fact | CK-12 FlexBook 2.0 | Lumen Learning |
|---|---|---|
| Accessibility | CK-12’s 2024 VPAT states that the FlexBooks 2.0 platform meets AA conformance across the criteria covered by the report. | Lumen aims to meet WCAG 2.0 Level AA criteria and describes screen-reader text, image alt text, video captions and transcripts, and text alternatives for interactives. |
| Customization | Teachers can customize and create FlexBooks, chapters and sections and add existing CK-12 content. | Lumen courseware is fully customizable after delivery into Canvas, Blackboard, D2L Brightspace, or Moodle, and can be adjusted for different term lengths. |
| Headquarters | CK-12 lists its headquarters at 4300 Bohannon Drive, Suite 200, Menlo Park, California. | Portland, Oregon, United States |
| Purpose | FlexBooks are customizable digital textbooks for K–12 subjects including science, math, and social studies. | Lumen Learning is an educational technology company that develops affordable digital courseware and faculty professional development resources for higher education. |
| Security | CK-12 says it uses administrative, technological and physical safeguards and encrypts transmissions with SSL or similar technology, while disclaiming a guarantee of security. | Lumen Learning passed a SOC 2 Type 2 audit valid for a 12-month period in December 2025, with audit results available to institutions or individuals after an NDA. |
CK-12 FlexBook 2.0 plans
- CK-12 FlexBook 2.0Free
- FlexBook 2.0Free
Lumen Learning plans
- Per Student Course Support Fee$35, paid once
- Success Accelerator for Waymaker and OHM$350, paid once
- Lumen Circles Fellowship$750, paid once
- Annualized Pricing—
Pick CK-12 FlexBook 2.0 if…
FlexBook 2.0 suits K–12 educators who want to adapt textbook chapters and assign lessons or practice to classes and differentiated groups. Students can use its lessons and adaptive practice, while the browser access supports a range of device types.
Pick Lumen Learning if…
Lumen suits higher education faculty and institutions seeking digital course materials, customization, and faculty support. It is particularly relevant for introductory, general education, and developmental courses.