| Price from | $149/mo | Free |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 3 | 2 |
| Spec score · PDF Flipbook Software | 8.6 (#10) | 7.6 (#24) |
| Accessibility | Flow offers ADA-compliant digital publishing and says its article mode supports screen readers. | The library respects reduced-motion preferences, and built-in controls include labels and focus styles. |
| Support | 3D Issue offers support across its platforms and provides a contact support link and knowledge base. | Licensing, integration, and production-use questions can be sent to [email protected] or through the contact form. |
