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
Canvases for organizing multiple campaign assets together
Project Memory to store brand context once for reuse
Custom templates for reusable workflows
SEO article generation with WordPress integration
AI image generation for marketing and social content
Support for 108 languages
Content types including ads, emails, social posts, blog posts, and landing pages
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
Maintains consistent brand voice across all content automatically
Reduces time from idea to finished, publishable content
Trusted by 30,000+ business owners and marketers
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
WordHero
Chaptora