Table of Contents
Sudowrite is a fiction writing assistant with its own fiction-trained model, Muse, and a Story Bible the model reads on every generation. NovelAI is an unlimited text engine with its own models and a Lorebook, and no outlining or revision tools. Both write adult fiction without refusing. The rest of this comparison covers prose, memory, plotting, revision and price, and names where NovelAI wins. We make Sudowrite. Prices are as of October 2026.
TL;DR: Pick Sudowrite if you want an AI that knows your characters, helps you plan, and revises with you, from $10 a month billed annually. Pick NovelAI if you want unlimited generation for a flat $10 to $25 a month, you build large worlds in a Lorebook, and you don't want structure imposed on you. Both write adult fiction without refusing. Only one of them will help you outline.
Sudowrite vs NovelAI at a Glance
| Sudowrite | NovelAI | |
|---|---|---|
| Price | $10, $22 or $44 a month billed annually. Monthly billing costs more | $10, $15 or $25 a month. No annual discount |
| How you pay for words | Monthly credits. Max rolls unused credits over for 12 months | Unlimited text on every tier |
| Model | Muse, trained for fiction, plus 20+ other models | NovelAI's own models, trained in-house |
| Remembers your book | Story Bible, read by the AI on every generation. Series Folder across books. Up to 25 linked chapters | Lorebook, keyword-triggered entries. Memory size depends on tier |
| Outlining and plotting | Canvas, Outline, Scenes, First Draft | None |
| Revision tools | Rewrite with preset modes, Describe, Expand, Feedback | Instruct the model in brackets |
| Adult fiction | Muse doesn't refuse | Doesn't refuse |
| Learning curve | Short. Buttons do the prompting | Long. Settings and syntax to learn |
| Free trial | Yes, no credit card | Trial period, terms on their site |
The Core Difference: An Assistant or a Sandbox
Sudowrite is organised around the jobs of writing a novel. Brainstorm for ideas, Story Bible for the world, Canvas and Outline for structure, Write for the next passage, Describe and Expand for texture, Rewrite and Feedback for revision. It has opinions about how a book gets made and it nudges you along them. If you've ever wanted a collaborator who already read the craft books, that's the pitch.
NovelAI is a text box and an engine. There are no plotting buttons. You type, it continues, and a dense settings panel lets you control randomness, repetition and which module is steering the style. The Lorebook holds your world. Everything else lives in your head and in the document. Writers who find structure suffocating love this. Writers who want help finishing a book usually don't.
Prose and Voice
Sudowrite's prose comes from Muse, its own model trained for fiction rather than for emails. Write continues from your cursor in Auto, Guided or Tone Shift mode and keeps the whole story in mind, reading up to 20,000 words of what came before. Give the Style section of your Story Bible a sample of your own prose and Muse matches it. Describe adds sight, sound, touch, taste and smell to a flat line. Expand turns a sparse sentence into a textured paragraph.
NovelAI's models are its own too, and they produce distinctive, less sanitised prose once you've tuned them. You can load modules that steer the style toward a genre or an author. The ceiling is high. So is the floor you have to climb from: with default settings and no Lorebook, the output rambles.
Verdict: Sudowrite gets you good prose in your voice in the first session. NovelAI gets you distinctive prose if you're willing to learn the controls.
Keeping the Story Straight: Story Bible vs Lorebook
The Story Bible is read by the model every time it writes. Genre, Style, Synopsis, Characters (up to 2,000 of them), Worldbuilding and Outline all feed the next passage. Chapter Continuity links up to 25 documents so chapter nine knows what happened in chapter two. The Series Folder shares the Story Bible across the books in a series. You fill in cards. The AI does the remembering.
The Lorebook is a keyword-triggered knowledge base. You create entries for a character, a sword, a treaty, and attach activation keys. When a key appears in your recent text, the entry is injected into the model's context. You can control order and probability and build cascading entries. For sprawling fantasy worlds it's powerful, and it rewards people who enjoy configuring things. It doesn't plan anything, and the amount it can hold at once depends on the tier you pay for.
Verdict: Lorebook for maximum control over a huge world. Story Bible if you want the memory handled for you and carried across a series.
Plotting and Structure
This one isn't close. Sudowrite has Canvas, an infinite whiteboard with Hero's Journey, Hollywood Beats, Story Circle and Romance Outline templates. It has Outline inside Story Bible, Scenes to break chapters down, and Draft to turn Scenes into prose. First Draft takes a blank document and a premise and produces up to 3,000 words to react to.
NovelAI has no plotting tools. You can write an outline in the editor and ask the model to continue from it, and that's the extent of it.
Editing and Revision
Rewrite is Sudowrite's most used tool after Write. Highlight anything up to 6,000 words and choose a preset: Shorten, Show Don't Tell, More Inner Conflict, or Customize with your own instruction. Feedback reads a passage and comes back with five areas to improve. Chat, free on every plan, sees your Story Bible and your text and answers questions about both.
NovelAI's revision is manual. You select text and instruct the model in brackets. In expert hands it can do things presets can't. It also means every revision is a prompt you write yourself.
Adult Fiction and Refusals
Both tools write the scene. NovelAI's models don't refuse and never have. Muse is trained on fiction and doesn't refuse romance, horror or explicit content either. The difference is around the scene: in Sudowrite the characters' voices and the relationship history come from the Story Bible, so an intimate scene in chapter twenty sounds like the people from chapter one. If you write spicy fiction, our guide to writing steamy scenes with AI goes through the workflow.
What Each One Costs
NovelAI: Tablet $10, Scroll $15, Opus $25 a month, billed monthly with no annual discount. Text generation is unlimited on all three. The tiers differ in memory size and image generation.
Sudowrite: Hobby & Student $10, Professional $22, Max $44 a month billed annually. Monthly billing costs more. Every plan includes every feature, including Muse. Plans differ only in monthly credits: 225,000, 450,000 and 2,000,000, and Max rolls unused credits over for 12 months. The free trial needs no credit card. Current figures are on the pricing page.
If you generate enormous volumes and want to never watch a meter, NovelAI is cheaper. If you draft, revise and plan in one place and want the model to know your book, Sudowrite's Professional plan is where most writers land.
Which One Should You Pick?
Choose Sudowrite if you think in plot and structure, you want the AI to remember your characters without configuring anything, you revise as much as you draft, or you'd rather press a button than write a prompt.
Choose NovelAI if you're a worldbuilder first, you want unlimited generation for a flat fee, you enjoy tuning settings, or you want an engine that surprises you rather than an assistant that guides you.
If you're still deciding, the free story generator shows what Muse writes without an account, and the free trial needs no card. We've also compared Sudowrite with Novelcrafter and Claude, and listed the Sudowrite alternatives.
Frequently Asked Questions
Is NovelAI better than Sudowrite for NSFW writing?
Neither refuses. NovelAI gives you unlimited generation for a flat fee. Sudowrite gives you a fiction-trained model that reads your Story Bible, so the scene stays in character. Writers who want volume pick NovelAI. Writers who want continuity pick Sudowrite.
Does NovelAI have a Story Bible?
No. Its equivalent is the Lorebook, a keyword-triggered knowledge base. It stores lore well and plans nothing. Sudowrite's Story Bible also holds the outline and is read by the model on every generation.
Which is cheaper, Sudowrite or NovelAI?
Both start at $10 a month. NovelAI's top tier is $25 with unlimited text. Sudowrite's top tier is $44 billed annually with 2,000,000 credits a month and rollover. For very heavy generation NovelAI costs less. For writing, planning and revising in one tool, compare what you'd pay for the pieces separately.
Can I use Sudowrite without learning prompts?
Yes. Write, Rewrite, Describe, Expand and Brainstorm are buttons with modes. Chat is there if you'd rather talk to the model.