A novel-length
co-author for serious writers.

Pro Writer V2.38 turns your variables, character bibles, and editorial intent into chapter-by-chapter prose with Anthropic’s Claude Sonnet 4.5 — then lets you tighten, visualize, and export the result.

Claude Sonnet 4.5 in the loop

Stream chapters, revisions, and continuations directly into the editor.

Four editing modes

Outlining, Drafting, Revision, and World-Builder — with mode-aware prompts.

Per-character bible

Trait sliders, voice sheets, arc graphs — all referenced by Claude.

Export anywhere

PDF, DOCX, EPUB, Markdown — your OS Save dialog writes the file.

Pro Writer

Version 2.38

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We use Google to keep your projects private. Your chapters, characters, and conversations are stored only against your account.

By signing in you agree to use this prototype responsibly. Claude generations consume tokens — you can top up at any time via secure Stripe checkout, or use your own Stripe API key.

First user to sign in inherits the demo project. Admin

A novel-lengthco-author for serious writers.

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A novel-length
co-author for serious writers.