| What it does | AI workspace and notebook for long-form writing
| Context-aware AI book editor for authors
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
| AT
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| Pricing model | Freemium
| Freemium
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| Pricing | Free: $0, includes one project with up to three documents, unlimited notes and version history, imported sources, and 50,000 lifetime starter AI tokens. Pro monthly: $9.99/month with 1,000,000 AI tokens per month. Pro annual: $69.99/year with 1,000,000 AI tokens per month.
| Octavo: Free forever (1 project, 3 research files, limited AI usage). Quarto: $20/month or $200/year (unlimited projects, 50 files per project, 10× more AI usage). Folio: $100/month or $1,000/year (unlimited research files, 5× more AI usage than Quarto, priority queue, early access to new models).
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| Key features | - AI writing operations scoped to a passage (expand, outline, strengthen, summarize, critique, tone, plot, rewrite)
- Long-form projects keeping notes, sources, documents, versions together
- Voice Profile keeps whole manuscripts in consistent voice
- Audio notes transcribed into the project
- Long-form editor with outline navigation, word goals, focus mode, and local style statistics
| - Context-aware AI suggestions that read your chapters first
- Source-grounded edits from PDFs, URLs, and YouTube transcripts
- Red and green diffs requiring your approval
- Export to Amazon KDP, Apple Books, Lulu, IngramSpark, Google Play Books, Draft2Digital
- Chapter-aware AI agent
- Citation engine with Chicago-formatted bibliography
- Front matter and back matter editor
- Version history to save and restore manuscript versions
- Clean PDF and EPUB export with professional typography
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| What makes it different | - All writing and organization features work without AI; AI is optional
- AI operates on your notes and sources, not a blank prompt, keeping context across sessions
- Text never used to train AI models; all writing remains private
- Every AI result appears as a suggestion beside the draft; nothing rewrites in place without approval
- One project holds multiple chapters with notes and sources; suitable for book-length manuscripts
| - Keeps your entire book and research in context, unlike chat windows that start fresh each session
- Returns edits as approvable diffs you control, not auto-inserted changes
- Built specifically for book publishing with real front matter, back matter, and professional export formats
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 42 ▼ −1 (down) since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 18 | 4 |
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| Citation Flow (Majestic) | 35 | 22 |
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| Referring domains (Majestic) | 324 | 7 |
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STRUT
Chaptora