AI writing partner for fiction that helps novelists draft, describe, rewrite, and finish books while keeping their own voice
Context-aware AI book editor for authors
Stage
Established
Not given
Founded
2020
Not given
Based in
Not given
AT
Pricing model
Free trial
Freemium
Pricing
Not given
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).
Key features
Write feature with style-matching suggestions for overcoming writer's block
Describe and Expand to turn sparse sentences into vivid sensory prose
Rewrite feature for revising and tightening prose without losing intent
Story Bible for maintaining character, world, and plot consistency across manuscripts
Canvas for visual story planning with outline templates
Chat for asking questions about your story grounded in Story Bible
Feedback feature providing five actionable areas for improvement
Visualize to generate character art from descriptions
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
What makes it different
Proprietary Muse and Ballad AI models trained specifically for fiction
Built by writers for writers who understand storytelling craft
Keeps your unique voice instead of producing generic chatbot prose
Unlimited creative freedom including unfiltered writing of adult scenes
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
Sudowrite
Chaptora