Calliope
8.0#19 in writing appsFrom €99 a yearFree planWebAPI
VisitCalliope vs Substack
What both publish
| Fact | Calliope | Substack |
|---|---|---|
| Free plan | Yes | Yes |
| Integrations | The MCP connector supports Claude, ChatGPT, and Cursor, and Calliope also documents a Writer API. | Official integrations include RSS, podcast distribution to Apple and Spotify, Google Analytics 4, Google Tag Manager, X and Facebook pixels, Google site verification, YouTube and LinkedIn account connections. |
| Privacy | The privacy policy says Rhymenoceros is a GDPR controller, uses hosting, AI-model, analytics and payment subprocessors, does not sell content or build advertising profiles, and supports deletion requests. | Substack's privacy policy says it endeavors to protect personal information but cannot guarantee complete security. |
| Purpose | Calliope is a manuscript studio for novelists, with AI for research, canon memory, and consistency checking. | Substack is a publishing platform for writers, creators, and subscribers. |
Calliope plans
- Free editorFree
- €10 credit pack€10, paid once
- €50 credit pack€50, paid once
- €100 credit pack€100, paid once
- Subscription monthly€12 a month
- Subscription annual€99 a year
Substack plans
- Free publishingFree
- Free to startFree
- Custom domain$50, paid once
- Paid subscriptions—
Pick Calliope if…
Calliope may suit book writers who want outlining, chapter organization, and continuity tools in a web editor. Its free plan is relevant to writers working on unlimited books.
Pick Substack if…
Substack suits writers, journalists, podcasters, video creators, experts, educators, and media companies building a direct subscriber audience. It is useful for creators who want multiple media formats, audience discovery, segmentation, email automation, and paid subscription options.