Table of Contents
If you've heard of Sudowrite but aren't sure what it actually does, this is the tour: what each tool is for, how they fit together, and where to start depending on where your book is.
TL;DR: Sudowrite is an AI co-writer built only for fiction. Its Story Bible holds your characters, world, and outline; its fiction-trained Muse model writes unfiltered prose in your voice; and Write reads up to 20,000 words of your manuscript before continuing, so the AI knows your book, not just your last message. Every plan includes every feature, and the free trial needs no credit card.
The short version: Sudowrite is an AI writing partner built exclusively for fiction. It was founded in 2020 by Amit Gupta and James Yu, two science fiction writers who ran a writing group together before building the tool, and it's been covered by The New Yorker and The New York Times. Everything about it is organized around one idea: the AI should know your story and support your voice, not replace either.
Story Bible: the part that makes everything else work
Most AI tools forget your book the moment the conversation scrolls. Sudowrite's answer is the Story Bible: a living knowledge base for your project that holds your synopsis, genre and style notes, characters, worldbuilding, outline, and scenes.
The flow runs Braindump → Synopsis → Genre/Style → Characters → Worldbuilding → Outline → Scenes → Draft. You can start messy: dump every idea you have into the Braindump, and use the tools to shape it forward step by step. Or skip ahead if you already know your story.
The point is what the Story Bible feeds: the core drafting tools (Write, Draft, Expand, and Chat) consult it before generating a word, which is how your protagonist keeps her eye color in chapter twelve and your magic system holds its own rules. If you're a pantser who'd rather discover the story as you write, you can fill the Story Bible in as you go; nothing forces you to outline first.
It scales to real books, too: up to 2,000 characters per Story Bible, imports of up to 60,000 words of existing character and worldbuilding notes, and a Series Folder that shares your characters and world across every book in a series, so book three stops contradicting book one.
Muse: the prose model trained on fiction
Under the hood, most AI writing tools run the same general-purpose models you can use anywhere. Sudowrite built its own: Muse, a model trained specifically for fiction. That shows up in two ways writers care about. The prose reads like narrative rather than a chatbot's summary of one. And Muse is unfiltered: it doesn't refuse dark scenes or fade to black on adult content, which matters if you write horror, romance, or anything a general AI treats as a policy problem.
Prefer another model for a particular pass? Sudowrite also gives you access to models from OpenAI, Anthropic, Google, and others. But Muse is the default for a reason.
The writing tools, in the order you'll actually use them
First Draft. For the blank page. Give it your premise and it produces up to 3,000 words to get you moving. It's only available in an empty document, because its whole job is making sure the document doesn't stay empty.
Write. The workhorse. When you stall mid-scene, Write picks up where you left off, in your voice. Before it writes anything it reads up to 20,000 words of your preceding story plus your Story Bible, which is why the continuation sounds like page 212 of your book. Auto mode just continues; Guided mode lets you say what should happen next; Tone Shift nudges the register.
Rewrite. Revision without retyping. Select up to 6,000 words and rework them: tighter, more descriptive, more show-don't-tell, or your own custom instruction.
Describe. Sensory depth on demand. Select a moment and get options across sight, sound, touch, taste, and smell, plus metaphors. This is the fix for flat scenes, and the show-don't-tell deep dive walks through it with examples.
Expand. When a sentence is doing a paragraph's job: select a sparse passage and it fleshes it out to match the texture of the rest of your prose.
Brainstorm. Idea generation across 11 categories (names, plot points, world details, and more). One honest caveat: Brainstorm doesn't consult your Story Bible, so treat it as a fast idea partner rather than a story-aware one.
Draft. Chapter generation from your Scenes. Once your Story Bible has an outline and scenes, Draft turns a scene into prose, using Muse by default. This is the pipeline that takes indie authors from outline to a working chapter.
Chat. A writing assistant that can see your full Story Bible and story text. Ask it whether your midpoint sags or where you revealed too much. Chat only mode uses no credits, which makes it the natural first thing to try.
Canvas. A visual whiteboard for story planning, with four outline templates: Hero's Journey, Hollywood Beats, Story Circle, and a Romance Outline.
Visualize. Generates an image (1024×1024) from a selected passage, for when you want to see a character or place.
Chapter Continuity. Links your chapters (up to 25 documents) so the AI carries context across them instead of treating each file as a stranger. It is also your best defense against continuity errors.
Two ways to start
Blank page: Braindump whatever you have into the Story Bible, let it help you shape a synopsis and characters, sketch scenes, then use Draft or First Draft to get words flowing. Talk to Chat whenever you're unsure what's next.
Existing manuscript: Paste or import your draft, fill the essentials of the Story Bible (imports help here), and hit Write at the point where you stalled. It reads what came before and continues in your voice. You'll feel the difference on the first continuation.
What it costs
Every plan includes every feature; plans differ only in monthly AI credits. Hobby & Student runs $10 a month, Professional $22, and Max $44 with credit rollover, and paying yearly saves up to 50 percent. The free trial requires no credit card.
Your work stays yours: Sudowrite claims no rights to your writing and doesn't train on it.
FAQ
Does Sudowrite write the book for you?
No, and it isn't trying to. Sudowrite is a co-writer: you decide what happens and what stays; it helps you get unstuck, keep continuity straight, and draft faster. The imagination is still your job.
How is Sudowrite different from ChatGPT?
Three ways. Muse is trained on fiction, so the prose reads like a novel rather than an answer. The Story Bible plus a 20,000-word reading of your manuscript means Sudowrite knows your book, not just your last message. And there's no prompt engineering: the tools are shaped around fiction workflows.
Will it keep my voice?
Keeping your voice is Sudowrite's core design goal. Write reads your preceding prose before continuing, and Style Examples teach Muse your register, so suggestions extend your voice instead of replacing it.
Does it work for adult or dark content?
Yes. Muse is fiction-trained and unfiltered: no refusals, no fading to black. You set the intensity.
Can I use it for a series?
Yes. Sudowrite's Series Folder shares your Story Bible across books, which is exactly what multi-book continuity needs.
What languages does it support?
Sudowrite supports 30+ languages.