Co-author
A writing buddy that knocks first.
Manuscript-aware AI that proposes. You accept. Your voice stays yours.
Last updated: 2026-07-16
Propose-only by default
The co-author never silent-overwrites your page. Suggestions show as proposals — accept, reject, or discuss. Auto-accept is an optional preference for draft mode.
Tools, not just chat
Create/rename chapters, update synopsis, touch bible and map edges, search the manuscript, propose prose. Agent loop with streaming — built as workspace tools, not a toy autocomplete.
Honest billing
Writer includes ~$5 monthly co-author credit; Pro ~$10. Top up with Spark ($4), Draft ($12), or Marathon ($28) packs. No Max plan circus.
FAQ
Does the AI read my whole book?
It works with open chapters, outline/bible context, and keyword manuscript search. Full multi-book vector RAG is intentionally deferred until needed.
Can it match my voice?
Author DNA can sync from your writing and optional templates. Voice is a first-class preference — not an afterthought prompt.
Related
Open a manuscript tonight.
Core free forever. Writer $5 · Pro $10. AI packs prepaid. You keep creative control.