CK-12 FlexBook 2.0 vs VitalSource Bookshelf
| CK-12 FlexBook 2.0 | VitalSource Bookshelf | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | Free |
| Open source | No | No |
| Platforms | Web | Android, iOS, macOS, Web, Windows |
| Free plan | Yes | — |
| Access model | — | mixed |
| Offline access | — | Yes |
| Annotation tools | — | Yes |
| Institutional admin | — | Yes |
| Device support | — | web_desktop_mobile |
| Read-aloud support | — | Yes |
Both are listed in Best Digital Textbook Platforms. On Samsung Mobile US Press, VitalSource Bookshelf scores higher on our published basis.