CK-12 FlexBook 2.0 vs Perlego
CK-12 FlexBook 2.0
ck12.org
Perlego
perlego.comSide by side
| Figure | CK-12 FlexBook 2.0 | Perlego |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| Plans published | 2 | 3 |
| Spec score · Digital Textbook Platforms | 8.9 (#2) | 6.9 (#28) |
| Integrations | CK-12 lists Google Classroom, Canvas, Schoology, Kiddom, Clever and ClassLink as SSO or LMS partners. | For organisations with 50 or more subscriptions, Perlego says it can offer integrations with authentication systems, library discovery systems, and learning management systems. |
| 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. | Perlego’s 2025 publisher security whitepaper says it uses TLS for data in transit and AES 256-bit encryption for sensitive data at rest. |
| Support | Users can contact CK-12 Support by starting a support ticket or sending an email. | The help centre says customers can contact support through live chat or email. |
Plans
Perlego
- CompletePrice not published
- EssentialPrice not published
- Institutions & OrganisationsPriced on request
In their own words
CK-12 FlexBook 2.0
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.