Write a book with AI
AI Book Writer for Fiction or Nonfiction
Start from one sentence or your notes, and get an outline fitted to your novel, memoir or how-to book, plus chapter one.
Free to start. No card needed.
How to write a book with AI, step by step
Start with a short brief: who your book is for and what it promises them, or who your story follows and what they want. Then ask for an outline and rework it before any prose, giving each chapter one job, such as one takeaway or one turn in the plot. Pitching nonfiction to publishers? You may not need a finished manuscript: publishing veteran Jane Friedman explains that a publisher can buy the book from a proposal, then pay you to write it1. The book proposal template lays out each section.
Draft one chapter at a time, and give the tool your brief, the outline and the previous chapter each time, so names, facts and voice hold steady. Then revise every chapter as if a stranger drafted it, because in a sense one did. The Authors Guild advises authors not to let AI replace their voice, thinking and creativity2, and warns that AI tools often present fabricated information as fact. So in nonfiction, every story, figure and quote should come from your own life or a source you've checked.
Before you publish, check the rules. In the US, the Copyright Office says prompts alone don't make you the author of AI output3, though your own writing and creative changes to it can be protected. Amazon's self-publishing service, KDP, requires you to tell it about AI-generated text4 when you publish, even after substantial edits. The Authors Guild also advises telling your publisher up front and disclosing substantial AI writing to readers, for example in the front matter. If a contract or copyright filing is at stake, ask a publishing lawyer.
How it works
What the AI book writer does with your idea
Describe your book in a sentence, paste your notes, or attach a file with a draft, an outline or stories you want in it. River works out whether it's a how-to or business book, a memoir or a novel, and names its choice in the brief. Then it writes an outline shaped for that kind of book, plus chapter one, as a doc in your workspace. It keeps your names, facts and stories as you gave them, and tells your stories where they fit.
The outline fits the book. A how-to, business or self-help book gets a promise to the reader, then 10 to 12 chapters with one takeaway each. A memoir gets 12 to 18 chapters ordered by meaning rather than date, the way the AI memoir writer orders them, with open slots for memories you haven't shared. A novel gets about 24 chapters in acts, each saying what happens and what changes. Only writing fiction? The AI novel writer is built for it.
From there, the book grows a chapter at a time, whenever you ask for the next one. River rereads the brief, the outline and the chapter before, then writes it in its own doc, linked from the outline. In nonfiction and memoir, wherever a chapter needs a story, figure or quote you haven't given, River marks a gap instead of inventing one. Want just the chapter list? The book outline generator stops there.
How it works
From your idea to a book in progress
Describe your book
Type a sentence about your book, paste your notes, or attach a file with stories or a draft.
River spots the kind
It tells a how-to or business book from a memoir or a novel, so there's nothing to pick.
Get your first chapter
Your doc holds the brief, an outline shaped for your kind of book, and chapter one.
Revise and keep going
Fill the marked gaps, revise in your voice, then ask for chapter two or a change to the outline.
Friday Night, Handled · Chapter 1 of 12
The 4 p.m. Walk-Through
Most bad Friday nights are decided before the first guest sits down. By eight, you won't have time to notice that the ice machine is struggling or that table twelve wobbles. At four, you do.
[Your story: the night something failed that a walk-through would have caught.]
Start at the front door and walk the route a guest walks. [Source needed: how much first impressions shape a diner's view of the meal.]
Outline: 12 chapters, one takeaway each. Gaps marked for you: 1 story, 1 source.
What you'll get
An outline fitted to your book and its first chapter
- An outline shaped for your kind of book
- Chapter one, written out and ready to revise
- Nonfiction gaps marked, not filled with made-up facts
Before and after
Your idea in. A book you can build on out.
A guide for first-time restaurant managers on running a calm Friday night. I ran a 120-seat bistro in Leeds for nine years. Must cover the 4 p.m. walk-through, reading the reservation book, the pre-shift huddle, and what to do when the kitchen falls behind. My story for chapter 1: the Friday our walk-in fridge died at 6 p.m. and we lost half the menu.
Friday Night, Handled: A First-Time Manager's Guide to Service Without Panic. The promise: By the last page, you can run a full Friday service without losing the floor, the kitchen or your temper. Outline (first 3 of 12). 1. The 4 p.m. Walk-Through. Takeaway: spot what will break at eight before it does. 2. Reading the Book. Takeaway: turn the reservation list into a staffing plan. 3. The Pre-Shift Huddle. Takeaway: brief the team in five minutes flat. Chapter 1 opens: Most bad Friday nights are decided before the first guest sits down. Mine was decided at six o'clock, when the walk-in fridge died and took half the menu with it. [Source needed: how often kitchen equipment fails during service.]
Fiction gets a chapter plan with a job per chapter instead. Nonfiction gets takeaways and honest gaps.
What lands in your doc
What lands in your book doc
- A brief with a working title, who the book is for, and its promise or premise
- For a how-to, business or self-help book, 10 to 12 chapters with one takeaway each
- For a novel, about 24 chapters grouped into acts, each saying what happens and what changes
- Chapter one in full: 2,500 to 3,500 words for a how-to book, up to 4,000 for a novel
- In nonfiction and memoir, marked gaps for your own stories and sources instead of invented facts
- Each later chapter in its own doc, written after River rereads the outline and last chapter
Questions authors ask
Common questions
What is an AI book writer?
An AI book writer is a tool that plans and drafts a book with you, starting from your idea or notes. This one decides whether you're writing a how-to book, a memoir or a novel, then writes an outline built for that kind, plus the first chapter. Comparing tools first? See our guide to the best AI for writing a book.
How do I write a book with River?
Describe your book in the box at the top of this page: a sentence is enough, or paste notes or attach a file. River picks the kind of book, then writes the outline and the first chapter into your free River workspace. Fill any marked gaps, revise in your own words, and ask for chapter two when you're ready.
Can AI write a book?
Yes, AI can draft a whole book, but a draft isn't a finished book. The steadiest way is a chapter at a time, each written from the outline and the chapter before it, which is how River works. What AI can't supply is your judgment, your experience and, in nonfiction, facts you've checked. Those come from you as you revise.
Will it make up facts in my nonfiction book?
It's told not to. Where a chapter needs a statistic, study, quote or client story you haven't given, River writes a bracket such as [Source needed: …] or [Your story: …]. In a memoir, it writes [Your memory: …] instead of inventing a detail. The doc ends with a list of what only you can add. Check every claim yourself, especially on health, money or law.
Can I publish a book written with AI on Amazon?
Yes, but you have to tell Amazon. KDP's content guidelines4 require you to disclose AI-generated text, images or translations when you publish, and text an AI tool created stays AI-generated even after substantial edits. Writing you did yourself and only polished with AI needs no disclosure. When the book is ready, the KDP pack drafts your description and keywords.
How long should my book be?
For an adult novel, aim for 80,000 to 89,999 words, a range a Writer's Digest guide5 says won't scare off any agent. Science fiction and fantasy run longer, about 100,000 to 115,000. River sizes a novel's plan to its genre: about 85,000 words in 24 chapters for adult fiction. How-to books vary by subject, so River plans 10 to 12 chapters that each teach one thing.
Is the AI book writer free?
Yes, it is free to start. Your outline and first chapter open in a River workspace, where you can edit them, share them or ask River to change them. Paid plans add more AI use and access to the most advanced models.
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