7 Best AI Tools for Novelists in 2026

Key takeaways

• Sudowrite is the best AI tool for novelists who want help drafting: its Story Bible takes a book from idea to outline to chapter beats to prose, and its own fiction model, Muse, was trained on writing used with the authors' consent.

• Novelcrafter has the deepest story bible, called the Codex, and lets you plug in the AI model of your choice from $8 a month.

• ProWritingAid's Manuscript Analysis reviews a whole novel of up to 300,000 words in one run, and it works inside Scrivener.

• Claude can hold an entire manuscript in one conversation, which makes it strong for plot problems and full-book feedback.

• If you publish on Amazon KDP, you must disclose AI-generated text, but not AI you used only to brainstorm or edit your own writing.

What novelists actually use AI for

Most novelists who use AI aren't asking it to write the book. The common jobs are smaller: brainstorming plot fixes, keeping a story bible of characters and places straight across a series, drafting a rough scene to react to, and getting developmental feedback on a finished draft before it goes to a human editor or beta readers. Tools split along those lines. Some are built to generate prose, some to organize a book, and some only analyze what you've already written. Which one fits depends on how much of the writing you want to keep in your own hands.

How we ranked

We looked at how well each tool handles long-form fiction, story bible and continuity features, drafting and rewriting quality, manuscript-level feedback, which AI models it uses, what it does with your writing, and price.

The seven tools compared

1. Sudowrite - Best for drafting fiction

Sudowrite is an AI writing app built specifically for fiction writers.

What works: Its Story Bible walks a book from a braindump to a synopsis, characters, worldbuilding, an outline, and chapter beats, then drafts prose in a style you set. In the editor, Write continues your scene, Describe adds sensory detail, Expand and Rewrite rework passages, and Feedback flags weak spots. Its own fiction model, Muse, now on version 1.5, is trained only on writing used with the authors' informed consent, and Sudowrite also offers more than 30 other models. It says it doesn't train on your writing. Plans start at $10 a month billed yearly, or $19 billed monthly, and the Professional plan, $22 a month billed yearly, adds developmental edits, line edits, and beta reads.

What doesn't: It's built around generating prose, which won't suit writers who only want feedback, and heavy use spends credits quickly on the cheaper plans.

Best for: Novelists who want help drafting scenes in their own voice.

2. Novelcrafter - Best for a story bible and choosing your own AI model

Novelcrafter is a novel-writing app built around a detailed story bible, with AI you connect yourself.

What works: Its Codex tracks characters, places, and lore with aliases, tags, relationships, and a timeline of where each one appears, and Grid, Matrix, and Outline views help plan a book scene by scene. On the Hobbyist plan and up, you connect your own AI through an API key, so you can choose models from OpenAI or, through OpenRouter, Anthropic, Google, and others, and it supports local models if you want everything on your machine. Scene Beats turn a short outline into a draft, and chat can use one scene or the whole novel as context. Plans run $4 a month for the Codex alone, $8 with AI, and $14 with Workshop Chat, with a 21-day free trial.

What doesn't: AI usage isn't included, so you pay your model provider separately, and a ChatGPT subscription can't be connected.

Best for: Series writers who want a detailed story bible and control over which AI they use.

3. ProWritingAid - Best for editing a finished manuscript

ProWritingAid is a grammar and style editor with reports built for long fiction.

What works: Manuscript Analysis reviews a whole novel of up to 300,000 words in one run, covering plot, pacing, and character, and Chapter Critique gives notes chapter by chapter, once a day on Premium and up to 30 a day on Premium Pro. Its style reports flag overused words, pacing, and dialogue tags, and it works inside Word, Google Docs, and Scrivener. Premium costs $120 a year, about $10 a month, or $399 once for a lifetime license.

What doesn't: Manuscript Analysis runs on separately bought story credits, and the free plan runs each editing report on just 500 words, twice a day.

Best for: Authors revising a completed draft before it goes to an editor.

4. Claude - Best for plot problems and full-manuscript feedback

Claude is Anthropic's AI assistant, and its long memory makes it useful for working on a whole book at once.

What works: Claude can take up to a million tokens of context, depending on the model, so an entire novel fits in one conversation for questions about pacing, continuity, or a sagging middle act. Projects keep your manuscript, outline, and notes together across chats, and it's a strong sounding board for plot fixes and character motivation. Pro costs $20 a month, or $17 billed yearly, and the free plan includes up to five Projects.

What doesn't: It's a general assistant, so there's no built-in story bible or manuscript editor, and you need to switch off model training in its privacy settings if you don't want your chats used.

Best for: Writers who want a second reader for the whole book.

5. NovelAI - Best for genre and interactive fiction

NovelAI is a subscription AI storyteller with its own fine-tuned text models.

What works: Its Lorebook inserts character and world details into the AI's context whenever a keyword appears, which keeps a long story consistent. Text generation is unlimited on every paid plan, from $10 a month, and the $25 Opus plan adds its largest models and about 28,000 tokens of context. Stories are encrypted in your browser, and NovelAI says it can't read them.

What doesn't: Its context window is far smaller than Claude's or Gemini's, and the app is built for co-writing and interactive stories more than for planning and revising a traditional novel.

Best for: Genre writers and anyone who enjoys writing alongside the AI in real time.

6. Marlowe - Best for feedback without generative AI

Marlowe, from Authors A.I., is a manuscript report tool that analyzes your novel without writing any of it.

What works: Upload a manuscript of at least 20,000 words and Marlowe returns a developmental report on plot, story arc, characters, pacing, and dialogue, and compares your book with bestsellers in its genre. It was trained on rights-cleared novels, doesn't use your manuscript for training, and never writes or rewrites your text. Single reports start at $29.95.

What doesn't: It only analyzes, so it won't help you draft or fix a scene, and files must be .docx or ePub.

Best for: Novelists who want developmental feedback but don't want AI-written words anywhere near the book.

7. Gemini and Gemini Notebook - Best for research and series bibles on a budget

Gemini is Google's AI assistant, and Gemini Notebook, renamed from NotebookLM in July 2026, answers questions using only the sources you upload.

What works: Load your past books, research, and notes into a Notebook and it becomes a searchable series bible that cites where each answer came from, which helps with continuity across a long series. Gemini Notebook is included on the free plan, AI Plus costs $4.99 a month, and AI Pro at $19.99 adds a million-token context and higher Notebook limits.

What doesn't: It's a research and reference tool, with no manuscript editor or fiction-specific features.

Best for: Series authors who need to check facts from earlier books quickly.

Do you have to disclose AI in your novel?

On Amazon KDP, yes, for AI-generated content: text, images, or translations created by an AI tool must be disclosed when you publish, even if you edited them heavily afterward. AI-assisted work doesn't need disclosure, which covers your own writing that you used AI to edit, refine, or error-check, and AI used only for brainstorming. Copyright follows a similar line in the US: the Copyright Office says prompts alone don't make you the author of AI output, but the parts you write or creatively arrange yourself can still be protected. The Authors Guild also warns that book contracts include a warranty that the manuscript is original, so including AI-generated text can put you in breach.

Frequently asked questions

What is the best AI tool for writing a novel?

Sudowrite, for most novelists who want help drafting. Its Story Bible takes you from idea to outline to prose, and its Muse model was trained on consented fiction. Novelcrafter is the pick if you want a deeper story bible and your own choice of AI model.

Which AI tools don't train on your writing?

Sudowrite and Marlowe say they don't train on your work, NovelAI encrypts stories so it can't read them, and Novelcrafter can run local models so nothing leaves your machine. Claude and ChatGPT let you switch training off in settings.

Can AI give feedback on a whole manuscript?

Yes. ProWritingAid's Manuscript Analysis handles up to 300,000 words in one run, Marlowe produces a developmental report on manuscripts of 20,000 words or more, and Claude can read a full novel in one conversation.

Do I need to disclose AI use on Amazon KDP?

Only for AI-generated text, images, or translations. Brainstorming with AI or using it to edit your own writing counts as AI-assisted and doesn't need disclosure.

Can I copyright a novel written with AI?

The parts you write yourself can be copyrighted, and so can your creative selection and arrangement of AI material, but the US Copyright Office says prompts alone don't make you the author of AI-generated text.