Calliope vs Quillstone
| Calliope | Quillstone | |
|---|---|---|
| Free plan | Yes | Yes |
| Free trial | No | No |
| Paid from | €8.25/mo | Free |
| Open source | No | No |
| Platforms | Web | iOS, macOS |
| Free plan | Yes | Yes |
| Book outlining | Yes | Yes |
| Chapter workspace | Yes | — |
| Continuity tools | Yes | Yes |
| Rewrite controls | No | Yes |
| Export formats | Markdown, Google Docs, DOCX, EPUB, PDF | EPUB, PDF, M4B |
Both are listed in Best AI Book Writing Software. On Inferse, Calliope scores higher on our published basis.