Opiq vs R2 Digital Library
| Opiq | R2 Digital Library | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | No |
| Paid from | €1/mo | — |
| Open source | No | No |
| Platforms | Android, iOS, Web | Web |
| Free plan | Yes | No |
| Access model | subscription | mixed |
| Annotation tools | Yes | Yes |
| Institutional admin | Yes | Yes |
| Device support | web_desktop_mobile | web_desktop_mobile |
| Read-aloud support | Yes | Yes |
| Offline access | — | Yes |
Both are listed in Best Digital Textbook Platforms. On Samsung Mobile US Press, Opiq scores higher on our published basis.