AI book writing tools compared, with prices
Prices below were checked on each company's own pricing page on 22 October 2026. They are US dollar list prices and can change, so confirm on the vendor's site before you buy.
- BookBud.ai: an AI book writer for both fiction and nonfiction, from idea and outline to a full draft, cover, and EPUB, PDF and Word export. Free account with 25,000 credits and no credit card. Starter $19 a month (up to 3 books a month), Publisher Basic $49 a month (up to 15 books), Pro $99 a month (up to 50 books); paid yearly, $190, $490 or $990. Nonfiction can use verified citations drawn from OpenAlex, and every exported EPUB is checked with EPUBCheck. See BookBud pricing.
- Sudowrite: an AI writing partner built for fiction, with a story bible and its own fiction models. Hobby & Student $19 a month, Professional $29, Max $59; paid yearly, $10, $22 or $44 a month. Free trial with no credit card.
- Novelcrafter: a novel-planning and writing workspace with a codex for characters and worlds. Scribe $4 a month (no AI), Hobbyist $8, Artisan $14, Specialist $20. The AI plans use your own AI provider key, so model usage is billed separately by that provider. 21-day free trial.
- Squibler: an AI story and book writer. Free plan with 1,000 AI credits a month; Plus $29.99 a month ($15.83 a month paid yearly); Pro $89.99 a month ($49.17 a month paid yearly).
- NovelAI: AI story generation, mainly for fiction and interactive storytelling. Tablet $10 a month, Scroll $15, Opus $25.
- Atticus: not an AI writer but a book formatting tool for print and ebook layouts, $147 one time.
- General chatbots such as ChatGPT and Claude: flexible for brainstorming, outlining and rewriting, on their own subscriptions, but you manage the book's structure, continuity and export yourself.
Which one costs under $20 a month?
Several do. BookBud's Starter plan is $19 a month and its free account needs no card. Sudowrite's Hobby & Student plan is $10 a month when paid yearly. Novelcrafter's AI plans start at $8 a month plus whatever your own AI provider charges. NovelAI starts at $10 a month. Squibler has a free plan with a small monthly credit allowance.
Looking for a cheaper Sudowrite alternative for a whole book?
Sudowrite is strongest for fiction prose and revision. If you want a tool that also handles nonfiction with citations, makes the cover and exports retailer-ready EPUB files, BookBud's $19 Starter plan covers up to three books a month, and you can try it on the free 25,000 credits first.
Start with the kind of book you want to create
Before comparing tools, decide what kind of writing job you are asking AI to help with. A 20-page lead magnet, a 40,000-word nonfiction guide, a novel, and a children's picture book all need different workflows.
For short content, almost any capable AI assistant can help you draft. For a full book, the tool needs to help you hold the project together over time. The practical question is not just, "Can this AI write good paragraphs?" It is, "Can this tool help me finish a coherent book?"
Look for support in five areas:
- Book idea development and positioning
- Chapter outlines and structure
- Long-form drafting without losing the thread
- Editing and revision inside the project
- Export or publishing handoff after the manuscript exists
General chatbots are flexible but unstructured
ChatGPT, Claude, Gemini, and similar tools are useful for brainstorming, rewriting, outlining, and improving sections. They are flexible, fast, and often excellent at solving a specific writing problem.
The weakness is project management. A chatbot usually does not know your whole book unless you keep feeding it context. You may end up copying text between documents, rebuilding prompts, tracking chapter status manually, and asking the model to remember details it has already lost.
A general AI assistant can be a good choice when you already have a writing system and only need help with parts of the process. It is less ideal when you want a guided path from blank page to finished book file.
Dedicated AI book writers are better for completion
A dedicated AI book writing platform should do more than generate text. It should understand the stages of book creation: concept, outline, chapters, revision, cover, and export.
BookBud.ai is built around that full workflow. Authors choose fiction or nonfiction, configure the project, create an outline, draft sections, edit in a rich-text editor, create or upload a cover, and export usable files. That structure matters because most unfinished books do not fail from lack of ideas. They fail because the work becomes scattered.
Compare tools by workflow, not hype
When you are comparing the best AI tools to write a book, use a practical checklist.
Does it support long-form structure?
A book needs sections, chapters, or scenes that build on each other. If the tool only gives you one large text box, you will need to manage the structure elsewhere.
Can you edit inside the tool?
Drafting is only the first pass. You need a place to revise, expand, shorten, and improve the content without losing your project organization.
Does it handle fiction and nonfiction differently?
Fiction needs characters, stakes, scenes, pacing, and story continuity. Nonfiction needs reader promise, organization, examples, clarity, and often research discipline. A good book tool should respect that difference.
Can it create more than manuscript text?
Covers, section images, export files, and publishing handoffs are not extras for many self-published authors. They are part of getting the book out of your head and into a real product.
Is the pricing aligned with your publishing pace?
Some authors need help with one book. Others are building a catalog. The best tool for you is the one whose limits and pricing match your actual publishing rhythm.
When BookBud is a strong fit
BookBud is strongest for authors who want a guided AI book creation workflow rather than a loose chat session. It is especially useful if you want to:
- Create fiction or nonfiction from a structured setup
- Generate a chapter outline before drafting
- Draft individual sections without losing the larger book plan
- Edit in one place instead of copying between apps
- Generate or upload a book cover
- Export publish-ready ebook files
- Move toward distribution or print workflows after the draft is ready
It is not a magic button, and it should not replace your final judgment. You still need to edit, fact-check, choose the angle, and decide what belongs in the book. But it can remove a lot of the mechanical friction that keeps authors from finishing.
When another tool may be enough
A general AI assistant may be enough if you only need help with brainstorming, chapter summaries, blurbs, or revising a manuscript you already wrote elsewhere. Scrivener, Google Docs, Word, or Notion may also be enough if you like managing structure manually and only want AI in small bursts.
That is not a bad setup. The right answer depends on your tolerance for managing the workflow yourself.
The bottom line
The best AI to write a book is the one that helps you finish a useful, coherent manuscript and move it toward publication. For short tasks, a chatbot can be plenty. For full book creation, choose a tool that supports structure, revision, covers, export, and publishing handoff.
BookBud.ai is built for authors who want the whole path in one place: idea to outline, outline to draft, draft to edited manuscript, and manuscript to usable book files.
