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Calliope

writecalliope.ink

From €8.25/mo Free plan WebAPI
Visit writecalliope.ink
Spec score 9.0 #2 of 27 in AI Book Writing Software

What it is

Calliope is a manuscript studio for novelists who want help with research, organization, and consistency while keeping authorship of the prose. Its AI does not write the author's prose. The web-based studio organizes work into parts and chapters, with synopses, statuses, goals, deadlines, and live word, page, and print estimates. Ten craft lenses call attention to habits such as adverb use, filter words, sentence rhythm, sensory balance, and repeated echoes without rewriting the text. Its AI companion searches the web, reads sources, and answers research questions with citations in the page margin. Manuscripts can be exported to DOCX, EPUB, PDF, or Google Docs, and the export-format list also includes Markdown. The MCP connector works with Claude, ChatGPT, and Cursor, and a Writer API is documented. MCP can read manuscripts for free; subscription write access can change structure, annotations, and the Map, but not prose. Writing without an account stays in the browser; a free account saves it to Calliope. Pricing includes a free plan, one-time credit packs, and subscriptions.

Spec sheet

What it does
Calliope is a manuscript studio for novelists combining a distraction-free editor with AI research, canon memory and consistency checking; it deliberately does not write prose.Read 15 Oct 2026 · writecalliope.ink
Purpose
Calliope is a manuscript studio for novelists, with AI for research, canon memory, and consistency checking.Read 12 Oct 2026 · writecalliope.ink
Audience
The maker describes Calliope as intended for authors who want AI help with thinking and organisation while writing their own book.Read 12 Oct 2026 · writecalliope.ink
Free plan
YesRead 21 Sep 2026 · writecalliope.ink
Integrations
The MCP connector supports Claude, ChatGPT, and Cursor, and Calliope also documents a Writer API.Read 12 Oct 2026 · writecalliope.ink
Security
The privacy policy says reasonable technical and organisational measures are used to protect personal data, while noting absolute security cannot be guaranteed.Read 12 Oct 2026 · writecalliope.ink
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.Read 15 Oct 2026 · writecalliope.ink
Compliance
The operator says it processes personal data in accordance with GDPR and applicable Slovak data protection law.Read 12 Oct 2026 · writecalliope.ink
Support
The maker provides support and press contact by email at [email protected].Read 15 Oct 2026 · rhymenoceros.co
Headquarters
Bratislava, SlovakiaRead 28 Sep 2026 · writecalliope.ink
Maker
Calliope is operated by Rhymenoceros s. r. o., a small independent software studio based in Bratislava, Slovakia.Read 15 Oct 2026 · rhymenoceros.co
AI boundary
The product states that its AI does not write the author's prose.Read 12 Oct 2026 · writecalliope.ink
AI memory
Book memory carries author-approved corrections, voice-and-craft rules and glossary entries into later conversations and passes.Read 15 Oct 2026 · writecalliope.ink
AI research
The companion can search the web, read sources and answer with citations inside the writing margin.Read 15 Oct 2026 · writecalliope.ink
Ambience
An optional reactive backdrop changes as sentences are completed and can be left disabled.Read 15 Oct 2026 · writecalliope.ink
API cost tiers
API reads are free, AI operations consume credits or subscription allowance, and writes require the subscription.Read 15 Oct 2026 · writecalliope.ink
API write capability
The Writer API can persist prose supplied by a user's script, but it has no prose-generation endpoint and requires a subscription for write operations.Read 15 Oct 2026 · writecalliope.ink
Company registration
The legal operator lists Staré Grunty 3546/7A, 841 04 Bratislava, Slovakia and company ID IČO 56249314.Read 15 Oct 2026 · writecalliope.ink
Connector limit
MCP can read the manuscript for free, while subscription write access can edit structure, annotations, and the Map but cannot write prose.Read 12 Oct 2026 · writecalliope.ink
Consistency checking
Consistency checks compare prose with the Map using deterministic name-drift detection and an AI contradiction pass, leaving findings as reviewable notes.Read 15 Oct 2026 · writecalliope.ink
Craft lenses
Ten visual craft lenses expose patterns such as adverbs, filter words, sentence rhythm, sensory balance and echoes without rewriting text.Read 15 Oct 2026 · writecalliope.ink
Craft tools
Ten craft lenses highlight writing habits such as adverbs, filter words, sentence rhythm, sensory balance, and echoes without rewriting the text.Read 12 Oct 2026 · writecalliope.ink
Documentation depth
Documentation covers the app, writing canvas, structure, goals, Map, marginalia, AI companion, exports, billing, MCP and Writer API endpoint conventions.Read 15 Oct 2026 · writecalliope.ink
Entity detection
AI entity detection proposes characters and places found in a chapter for the author to accept or reject.Read 15 Oct 2026 · writecalliope.ink
Exports
Finished books can be exported to Markdown, Google Docs, DOCX, EPUB and typeset PDF; Markdown works without an account.Read 15 Oct 2026 · writecalliope.ink
Founder
The About page identifies Martin Rapavý as Calliope's founder and says he began building it to get editorial and memory help rather than ghostwriting.Read 15 Oct 2026 · writecalliope.ink
Independent listing
SaaSHub describes Calliope.ink as a Slovakia-based web and browser application and lists it as freemium with €10 AI credits.Read 15 Oct 2026 · saashub.com
Licence and ownership
The terms say Calliope software, design and trademarks are owned by the operator or licensors and protected by intellectual-property law; no open-source licence is offered.Read 15 Oct 2026 · writecalliope.ink
Limit: metered AI
AI chat, research, consistency checks, entity detection, synopsis generation and card suggestions consume credits or subscription allowance.Read 15 Oct 2026 · writecalliope.ink
Limit: no prose generation
Calliope intentionally does not draft, expand or rewrite prose, so writers seeking in-app generative rewriting are outside its design target.Read 15 Oct 2026 · writecalliope.ink
Limit: refunds
The terms state that fees are non-refundable unless applicable law requires otherwise.Read 15 Oct 2026 · writecalliope.ink
Limit: service availability
The terms provide the service as-is and as-available and disclaim guarantees that it will be uninterrupted or error-free.Read 15 Oct 2026 · writecalliope.ink
Limit: subscription for connected writes
MCP and Writer API clients are read-only for write-back operations unless the user pays the €12 monthly or €99 annual subscription.Read 15 Oct 2026 · writecalliope.ink
Manuscript structure
The studio supports parts, chapters, synopses, statuses, goals, deadlines, and live word, page, and print estimates.Read 12 Oct 2026 · writecalliope.ink
Map
The Map stores characters, places and established facts, including aliases, attributes and prose mentions.Read 15 Oct 2026 · writecalliope.ink
Marginalia
Notes, to-dos, references and chat threads are anchored beside the relevant paragraph rather than inserted into prose.Read 15 Oct 2026 · writecalliope.ink
MCP integrations
Claude Desktop, ChatGPT and Cursor can connect through MCP to read the manuscript, run Calliope AI tools and, with a subscription, modify structure, Map and marginalia.Read 15 Oct 2026 · writecalliope.ink
MCP prose boundary
MCP has no prose-write tool and cannot edit chapter prose, a restriction enforced in the protocol design.Read 15 Oct 2026 · writecalliope.ink
No-sign-up start
The editor opens without an account or payment card, and anonymous writing remains in the browser until the user signs in.Read 15 Oct 2026 · writecalliope.ink
Praise: author control
SaaSHub emphasizes that AI-derived details are proposals requiring author approval before becoming canon.Read 15 Oct 2026 · saashub.com
Praise: continuity
SaaSHub repeatedly highlights the character map, canon tracking and contradiction checking as the product's distinctive value for complex manuscripts.Read 15 Oct 2026 · saashub.com
Praise: focused writing
SaaSHub presents the distraction-free, minimalist editor and no-sign-up start as strengths for fiction writers.Read 15 Oct 2026 · saashub.com
Rating on SaaSHub
No rating; SaaSHub lists 0 reviews.Read 15 Oct 2026 · saashub.com
Research
The AI companion searches the web, reads sources, and answers research questions with citations in the page margin.Read 12 Oct 2026 · writecalliope.ink
Security statement
Calliope states that it uses reasonable technical and organizational safeguards but gives no absolute-security guarantee.Read 15 Oct 2026 · writecalliope.ink
Storage
Without an account, writing is saved in the browser; a free account saves it to Calliope, and local project-file open/save is described as forthcoming.Read 12 Oct 2026 · writecalliope.ink
Structure
Structure organizes parts and chapters with word counts, targets, statuses, reordering and synopsis styles.Read 15 Oct 2026 · writecalliope.ink
Writer API
The public Writer API uses HTTPS JSON at https://app.writecalliope.ink/api/v1 with Bearer personal keys and publishes OpenAPI 3.1 and llms.txt contracts.Read 15 Oct 2026 · writecalliope.ink
Writing canvas
The editor provides book typography, warm paper themes, dark mode, focus mode and typewriter scrolling.Read 15 Oct 2026 · writecalliope.ink
Writing statistics
The free studio includes a yearly heatmap, forgiving streak, writing persona, cast view and shareable Writing Wrapped.Read 15 Oct 2026 · writecalliope.ink

Plans and prices

Free editor Free Unlimited books · full editor · structure and goals · Map · marginalia · stats · DOCX/EPUB/PDF/Google Docs export Read 15 Oct 2026 · writecalliope.ink
€10 credit pack €10 a month One-time top-up €10 balance Read 21 Sep 2026 · writecalliope.ink
€10 credit pack €10, paid once one-time top-up €10 AI balance · no auto-renewal Read 15 Oct 2026 · writecalliope.ink
€50 credit pack €50 a month One-time top-up €55 balance Read 21 Sep 2026 · writecalliope.ink
€50 credit pack €50, paid once one-time top-up €55 AI balance · no auto-renewal Read 15 Oct 2026 · writecalliope.ink
€100 credit pack €100 a month One-time top-up €120 balance Read 21 Sep 2026 · writecalliope.ink
€100 credit pack €100, paid once one-time top-up €120 AI balance · no auto-renewal Read 15 Oct 2026 · writecalliope.ink
Subscription monthly €12 a month monthly €10 monthly Calliope AI allowance · MCP and Writer API write access Read 15 Oct 2026 · writecalliope.ink
Subscription annual €99 a year annually €10 monthly Calliope AI allowance · MCP and Writer API write access Read 15 Oct 2026 · writecalliope.ink
Writing studio Free Free · unlimited books All editor features · unlimited books · DOCX, EPUB, PDF, Google Docs export Read 12 Oct 2026 · writecalliope.ink
AI credits Price not published €10 → €10 of balance; €50 → €55 of balance; €100 → €120 of balance One-time top-ups · no auto-renew · powers AI actions Read 12 Oct 2026 · writecalliope.ink
Write with your own AI Price not published €12 / month or €99 / year (~31% off) MCP and Writer API write access · €10/month AI allowance · without subscription, MCP is read-only Read 12 Oct 2026 · writecalliope.ink

Every Calliope plan and price →

Strong points and limits

Strong points

  • AI research answers include citations in the page margin.
  • Ten craft lenses flag writing habits without rewriting text.
  • Tracks goals, deadlines, word counts, pages, and print estimates.
  • Exports to Markdown, Google Docs, DOCX, EPUB, and PDF.
  • Free editor plan includes unlimited books.

Limits

  • No free trial is listed.
  • Subscription write access cannot write prose.
  • Without an account, writing is saved only in the browser.
  • AI processing may involve third-party subprocessors.

Who it suits

Calliope suits novelists who want organizational and research assistance while writing their own prose. It may also fit authors who want chapter planning, craft feedback, and exports in several formats.

Verdict

Calliope brings manuscript organization, cited research, and craft checks into a studio that leaves prose writing to the author. The free editor supports unlimited books; AI access is handled through credit packs or subscriptions.

Where Specifiction places it

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