Free: 2,500 words per month, all intensities, API access (60 requests/min), document history, no credit card required. Pro: $19/month for 100,000 words per month, 300 requests/min API limit, priority support. Word pack: $9 for 50,000 words with no expiration or subscription.
Core Plan: $19/month (200,000 words of editing per month, limited rewriting ability). Pro Plan: $29/month (300,000 words of editing per month, able to rewrite entire chapters and books). A one-time free word sample is available for new accounts.
Key features
Self-hosted fine-tuned language model
Three intensity levels per request
3-5 second average response time
Content never used for training
Works with any AI model
Webhook support for real-time events
Dashboard with API key management
Document history and web-based interface
Sentence-level literary feedback
Paragraph-level literary feedback
Passage-level literary feedback in context
Chapter-level literary feedback in context
Book-level literary feedback in entire context
One-click text rewriting with AI
Entire chapter rewriting on Pro Plan
Entire book rewriting on Pro Plan
300,000-word context window on Pro Plan
Progressive learning through interactive Q&A
What makes it different
Rewrites sentence structure and rhythm, not just synonyms
Completely private with no data sharing or third-party APIs
Simple integration with any HTTP client
Generous free plan without credit card requirement
API-first design for programmatic use at scale
Human book editors charge thousands but AI Book Editor starts at $19 per month
Gives almost immediate feedback while human editors take weeks
300,000-word context window three times more than average novel
All output belongs 100% to the user for commercial use