📚 Books & audiobooks (KDP, Audible)
Create books & fiction for Books & audiobooks (KDP, Audible) with AI
Novels, non-fiction books and long-form fiction. We ranked 6 apps that make it, favouring the ones built for Books & audiobooks (KDP, Audible), then grouped them into a stack you can actually use.
Typical shape on Books & audiobooks (KDP, Audible): manuscript, cover image and narrated audio.
Your stack, step by step
The strongest picks in each kind of tool that makes books & fiction. Most creators combine two or three of these.
Tools that fit, ranked
1
AI writing partner built for novelists: drafting, rewriting, feedback and story bible
8.3/10
What it is Sudowrite is an AI writing app made for fiction writers. Instead of a general chat box it gives novelists tools for continuing a scene, describing a setting with the senses, rewriting passages, brainstorming plot and characters, and building a Story Bible that turns an outline into chapters. It outputs prose, outlines and feedback on your manuscript. Key… Read more →
Pros
- Tools designed for fiction: Write, Describe, Rewrite, Brainstorm and Story Bible
- Proprietary Muse model trained for fiction alongside Claude and OpenAI models
- Claims no rights over anything you input or generate
- Annual billing halves the price; Max rolls credits over for 12 months
Cons
- Credit-based: long drafts burn through credits quickly
- Feedback feature only from the Professional plan
- AI prose still needs heavy editing to sound like you
- Some parts of the writing community object to AI fiction tools
Pricing: Paid from $10/mo · fiction novel-writing story-bible creative-writing authors
🔥 Deal: Yearly billing is 50% off every plan
2
Anthropic's assistant for long-form writing, research, documents and code
8.8/10
What it is Claude is Anthropic's AI assistant, available on the web, desktop and mobile apps. It writes and edits text, researches the web, reads long documents, builds artifacts (documents, small apps, diagrams) and creates files such as documents and slide decks. It is text-first: Claude does not generate images, video or audio. Key features - Long context for working… Read more →
Pros
- Strong at long-form, natural-sounding prose and editing
- Skills and MCP connectors on every plan, including Free
- Artifacts, file creation and Claude Docs/Slides for finished documents
- Terms assign output ownership to you
Cons
- No image, video or audio generation
- Free plan is limited to Sonnet and Haiku with 5 projects
- Usage limits are session/weekly based and can run out mid-project
- Max plans are expensive at $100+ per month
Pricing: Free plan, paid from $20/mo · chatbot anthropic writing long-form skills
🔥 Deal: Pro is $17/month billed annually instead of $20 monthly
3
Novel-writing workspace with a Codex story bible and bring-your-own AI models
8.2/10
What it is Novelcrafter is a writing app for novelists that combines a manuscript editor, a planning board and a Codex (a wiki-style story bible). You connect your own AI provider and use it to summarise scenes, extract characters, draft from scene beats and brainstorm in a Workshop chat. It supports novels, non-fiction, screenplays, poetry and fan fiction. Key features… Read more →
Pros
- Codex wiki tracks characters, places and lore with automatic linking
- Use any model via OpenAI, Anthropic, Google, OpenRouter or local Ollama/LM Studio
- Cheap plans from $4/month and a 21-day trial without a card
- Series support shares one Codex across books
Cons
- No AI credits included: you pay your AI provider separately (BYOK)
- The $4 Scribe plan has no AI features
- Setting up API keys and choosing models takes some learning
- Collaboration and team features only on the $20 Specialist plan
Pricing: Paid from $4/mo · fiction novel-writing byok story-bible openrouter
4
Subscription AI storyteller with its own text models and anime image generator
7.0/10
What it is NovelAI is a subscription service for AI-assisted storytelling and anime-style image generation, run by Anlatan. You write interactively with its text models, which continue your story, and generate illustrations with its own NovelAI Diffusion image models. It also offers text-to-speech. Key features - Story writing with NovelAI's own text models (GLM-based models, Erato and Kayra) - NovelAI… Read more →
Pros
- Unlimited text generation and text-to-speech on every paid tier
- NovelAI Diffusion V4.5 anime image model built in
- Says you can use your AI anime art as you wish, commercially too
- Opus includes free image generations under set conditions
Cons
- Free trial is small: 50 text and 30 image generations
- Best context size and exclusive models need the $25 Opus tier
- Own text models trail frontier models for long, coherent plots
- Anime-focused image model is narrow in style
Pricing: Paid from $10/mo · fiction storytelling anime image-generation roleplay
5
AI book and screenplay generator that drafts full manuscripts from a premise
6.4/10
What it is Squibler is an AI writing app that generates books and screenplays. You enter a concept, genre and core elements, and it produces an outline and a full draft organised into chapters and scenes, which you then edit in its Smart Writer. It also turns text into images and short videos for promotion or storyboarding. Key features -… Read more →
Pros
- Generates full 200-300 page manuscripts on Plus
- Keeps characters and plot consistent across chapters
- Free plan with 1,000 AI credits a month
- Also turns text into images and short videos
- Says you keep full ownership of your work
Cons
- Whole-book generation encourages low-effort output
- Monthly Plus ($29.99) costs nearly twice the annual rate
- Does not disclose which AI models it uses
- Pro at $89.99/month is expensive
Pricing: Free plan, paid from $29.99/mo · fiction book-generator screenplay manuscript writing
🔥 Deal: Annual billing: Plus $15.83/month, Pro $49.17/month
6
Lex Freemium
Minimal collaborative writing editor with AI feedback from GPT and Claude
6.7/10
What it is Lex is a minimalist online word processor with AI built in. You write in a clean editor and ask Lex for feedback, title ideas or help continuing a paragraph. It is designed around keeping the writer in charge: the AI mostly critiques and suggests rather than generating whole articles. Key features - Distraction-free editor with keyboard commands… Read more →
Pros
- Clean, distraction-free editor that works as a Google Docs replacement
- AI feedback acts like a real-time editor instead of writing for you
- Pro gives access to GPT and Claude models
- Free sharing and live collaboration
Cons
- Pricing is not shown on the vendor's pricing page
- Small company; feature pace and longevity are uncertain
- Track Changes still listed as coming soon
- No image or other media generation
Pricing: Freemium · editor writing feedback collaboration minimal
The same model is often sold by several apps at different prices.
Anthropic's Claude models (Fable 5.1, Opus 5.5, Sonnet 5, Haiku 4.5) with 1M-token context
Anthropic · 2026-09
OpenAI's GPT-6 family (Astra, Sol, Luna) behind ChatGPT and the OpenAI API
OpenAI · 2026-09
Autonomous research agent that writes cited, long-form reports from web and local sources
★ 30k
Before you publish on Books & audiobooks (KDP, Audible)
Amazon KDP (books)
KDP requires authors to tell Amazon when a book contains AI-generated text, images or translations. AI-assisted work does not need to be disclosed.
- What must be labelled
- AI-generated content: text, images or translations created by an AI tool, even if you edited them heavily afterwards. Not required for AI-assisted work, such as content you created yourself and refined, edited or brainstormed with AI.
- How to disclose
- Answer the AI-generated content questions in the KDP publishing flow when you publish a new book or edit and republish an existing one.
All platforms · Official policy ↗
Audible / ACX (audiobooks)
ACX titles must be human-narrated unless ACX authorises otherwise. Amazon's own AI route is KDP 'virtual voice', whose audiobooks are clearly labelled.
- What must be labelled
- ACX bans unauthorised text-to-speech, AI or automated recordings (submission requirements, April 2026). Virtual-voice audiobooks made through KDP are labelled as computer-narrated.
- How to disclose
- Do not submit AI narration to ACX. For AI narration, use KDP's virtual voice beta (US, eligible eBooks), which applies the label for you.
All platforms · Official policy ↗
Same format, other platforms
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More for Books & audiobooks (KDP, Audible)
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