AI signature designer with 30+ celebrity styles personalized to your name
Stage
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Founded
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Based in
AT
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Pricing model
Freemium
Free
Pricing
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
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
Over 30 celebrity-inspired signature styles
Signature analysis on five dimensions
AI-generated personalized signatures
Step-by-step animated learning tutorials
Practice tool with scoring
Signature style quiz
Support for 21 languages
Before-and-after signature comparison
What makes it different
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
Hand-writable signatures, not just digital fonts
Designs created in minutes instead of days
Step-by-step teaching breaks signatures into maximum 8 steps
Chaptora
Calligra Signature