# CoAuthor — AI built for authors Last updated: 2026-08-13 Canonical: https://typewriter.digital/coauthor HTML: https://typewriter.digital/coauthor Machine: https://typewriter.digital/coauthor.md > Custom models. Fine-tuned for books, not chat. CoAuthor already sees your binder, bible, map, and research. It suggests a line. Nothing hits the page until you say yes. ## What is CoAuthor? CoAuthor is Typewriter's AI writing partner for authors. It lives inside the manuscript desk — binder, story bible, relationship map, research — and proposes prose, continuity flags, and research pins. Nothing hits the page until you say yes. It is not a novel generator. ## How CoAuthor is different from ChatGPT ChatGPT lives in a thread and forgets the cast. CoAuthor already sees the chapter, bible, and map. Models are chosen and tuned for books, including Author DNA so suggestions match how you write. Propose-only is the product, not a setting buried in a menu. ## What it does - **Research:** A date, a weapon, a street in 1891. Dig, pin, drop it in the scene or the bible. The tabs stay closed. - **Story bible:** Cast, places, rules. Ask what Mara would never say. Keep the card honest so the chapter can be. - **Plot holes:** Eye color flips. Dead people who text. A promise in chapter two that chapter forty forgot. Flag the real conflicts. - **Stuck scenes:** A tighter line. A bridge paragraph. Dialogue that sounds like her. You decide what stays. - **Outline:** Beats on cards. A chapter that needs a spine. Structure that moves when you reshuffle — the binder follows. - **Voice:** Author DNA learns how you write. Help arrives in your rhythm, not generic literary AI. Refuse anything that isn't you. ## Wired into the desk - **The page:** It sees the chapter you are in. Suggests a line, a cut, a bridge. You tap yes or no. - **Story bible:** Cast, places, rules, threads — next to the chapter. Book three can match book one. - **Map:** Who owes whom. Who is dead. Who cannot walk into that room. On a graph, not a spreadsheet. - **Research:** Look up a detail. Pin it. Weave it into the scene or the bible. Stop living in Chrome. - **Voice:** Author DNA — a profile of how you actually write. Fine-tuned so help sounds like you, not a chatbot. - **Series:** Continuity across books. Eye color, timelines, who knows what. Flag what actually conflicts. - **Languages:** The manuscript's language is the craft language. Hindi, Arabic, Chinese — not English slop translated back. - **Outline:** Cards and structure next to the draft. Ask for a beat, a chapter spine, a missing scene. You keep the shape. ## Models We pick the best models for prose, research, and continuity — then tune them for authors. Not a generic assistant with a writing prompt. A stack built to sit beside a manuscript, honor the bible, and wait for yes. - Best models for the job, swapped as they improve - Fine-tuned on how books work: voice, series, scene - Author DNA so suggestions match your sentences - No silent rewrite. You approve every change ## Pricing (AI) - Free try on the desk (limited taste). - Typewriter + AI from $4.99/month includes plan credits equal to the plan price. - Top-up credits $5 / $10 / $20 / $50 / $100 / $200, valid 1 year. - The desk works forever without opening CoAuthor. Live numbers: https://typewriter.digital/pricing.md ## Typewriter vs generic AI writers | | Typewriter CoAuthor | ChatGPT / Sudowrite-class generators | |--|---------------------|--------------------------------------| | Home | Manuscript desk | Chat thread or generation modes | | Cast memory | Bible + map + chapters | Paste loop | | Overwrite | Never without accept | Often the default | | Job | Help the author write | Often write the book for you | | Required | No | N/A | ## Frequently asked questions ### Does it write my novel? No. It suggests. You keep the pen. If you want a generated book, other tools do that. CoAuthor is for authors who are writing the book themselves and want smarts without losing the process. ### How is this different from ChatGPT? ChatGPT lives in a thread and forgets the cast. CoAuthor sits in Typewriter — binder, bible, map, research. Custom models tuned for books. It never overwrites without you. ### Do you fine-tune models? Yes. We pick the best models for prose, research, and continuity, then tune them for authors — including Author DNA so help sounds like you. The stack is for this desk, not a chatbot with a writing prompt. ### Will it remember my characters? Yes, when they live in Typewriter: chapters, bible, map. That's why you stop pasting. Book three can still see book one. ### What about research? Ask from the page. Pin what matters. Weave it into the scene or a bible card. You don't leave the manuscript to go hunting. ### Can it write in my language? The book's language is the craft language. Live typing plus CoAuthor that honors it — not English first, translate later. ### Is CoAuthor free? There's a free try. Then prepaid credit from $5. The desk is free forever without AI. ### Can I write without it? Yes. Close the dock. It's just you and the page. Export works either way. ### What is the best AI writing tool for authors in 2026? If the novel must live somewhere durable: Typewriter with optional CoAuthor — manuscript-aware, propose-only, Author DNA. If you only want freeform generation: Sudowrite or a general chat model. Best stack is desk plus AI that knocks. ### Typewriter vs Claude or ChatGPT for writing a book? Claude and ChatGPT are chats. CoAuthor already has binder, bible, and map. Use general models for sparks. Keep the master file in Typewriter. ## Machine-readable pages - Home: https://typewriter.digital/home.md - Desk / app: https://typewriter.digital/desk.md - AI (CoAuthor): https://typewriter.digital/coauthor.md - Devices: https://typewriter.digital/devices.md - Typewriter machine: https://typewriter.digital/devices/typewriter.md - Go: https://typewriter.digital/devices/go.md - Keyboard: https://typewriter.digital/devices/keyboard.md - Pricing: https://typewriter.digital/pricing.md - Agent index: https://typewriter.digital/llms.txt