CoAuthor
Looking for an AI tool to help write a book — not steal the book? CoAuthor is manuscript-aware, propose-only, and optional.
CoAuthor is Typewriter’s AI partner for long-form authors. It lives next to the chapter — not in a separate chat tab — and can use binder, story bible, and series context when you ask for help.
It is built for research, continuity, stuck scenes, and structure work. It is not optimized to auto-generate a full novel while you sleep.
Your coauthor should knock. Suggestions show as proposals. Accept, reject, or discuss. No silent overnight rewrite of your page.
Auto-accept is an optional draft-mode preference. Never forced. Never the default for serious work.
Chat is brilliant for sparks. It is a weak home for an 80,000-word book. Cast amnesia, paste loops, and rewrite culture are the product tax.
CoAuthor stays inside the manuscript desk. The master file remains Typewriter. AI help is optional fuel — free try, then CoAuthor+ prepaid credit from $5.
Create or rename chapters. Update synopsis. Touch bible and map edges. Search the manuscript. Propose prose. Agent-style multi-step jobs when you escalate.
Built as workspace tools, not a toy autocomplete that forgets where the book lives.
CoAuthor is separate from the desk. Free try (limited). CoAuthor+ prepaid credit from $5 (valid 1 year). Desk plans never force AI.
Write free forever. Add Typewriter+ one-time for bible and map if you want craft depth without AI. Stack only what you use.
If you want AI to write the whole ebook from one idea — chapters, cover, store files — that is Instant Ebook, not desk CoAuthor. Same credits wallet. Preview without an account. Typical book about $4.50.
Start at /coauthor or /make. Desk CoAuthor stays propose-only inside a manuscript you are writing.
Updated 2026-09-17. Same desk as the home page — this room is just deeper.
If the novel must live somewhere durable: Typewriter with optional CoAuthor. If you only want freeform generation: Sudowrite or a general chat model. Best stack is often desk + optional AI that knocks.
It can draft suggestions. It will not silent-own the manuscript. Propose-only means you accept or reject every change.
It works with open chapters, outline and bible context, and keyword manuscript search. Full multi-book vector RAG is intentionally deferred until needed.
Author DNA can sync from your writing and optional templates. Voice is a first-class preference, not an afterthought prompt.
Typewriter free desk forever. CoAuthor free try. CoAuthor+ prepaid from $5 when you want more fuel. No card required to start writing.
Sudowrite optimizes fiction generation modes. NovelCrafter optimizes BYO keys and codex power users. Typewriter optimizes manuscript home first, with optional propose-only AI.
Same product. Different room. Pick the next deep dive.
Calm paper editor. Real chapters. Tools appear when you need them.
Deep diveNot a 7-day trap. Manuscript software free forever for authors.
Deep diveNot headings. Not hope. A binder that knows the book.
Deep diveDo not retype chapter one to try a new desk.
Deep dive
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