AI novel writer
An AI novel writer that remembers chapter two in chapter nine.
Describe your story. PromptBook plans it chapter by chapter, free, then drafts the whole thing while keeping track of who knows what, who is where, and what already happened.
- Romance, thriller, fantasy, sci-fi or general fiction
- Every chapter checked against the story so far
- Choose the point of view before it writes a word
Reading your idea…
Drafting a chapter-by-chapter plan · 0s
Plans usually take a minute or two. Keep this tab open.
While you wait, read how it worksYour chapter plan is ready
or
Free · no card · no password needed. We email you when it's written.
Your book is being written
We've emailed . Click the link in that email to watch it being written. We'll email you again when it's finished (about an hour).
No email in a few minutes? Check your spam or promotions folder.
Your chapter plan
Your book
Working title · you can change it before PromptBook writes a word
Want to read it before you commit?
PromptBook will write the opening of chapter 1 from this plan, free, with no account. Usually under 30 seconds.
Writing your opening…
0s · this is the same engine that writes the whole book
Chapter 1 ·
That's the opening, written from your plan.
Write the whole book free Free · no card · just an email addressReady to turn this plan into a book?
Continue with Google, or just give us your email address. PromptBook writes every chapter in the background and emails you when it's done. You don't need to keep this page open.
Free plan: 1 complete book a month with EPUB, PDF and Word export. No card needed. Sign up with Google in one click.
370+ full-length books written with PromptBook · 10.9 million words
or
Free · no card · no password needed. We email you when it's written.
Continuity
How it keeps a long story straight
Ask a chatbot for chapter nine and it has often forgotten chapter two: the sister who was dead is back, the knife is in the wrong drawer, the detective knows something she hasn't found out yet. That's the problem PromptBook is built around.
- Before writing, it records the facts of your story: the cast and their relationships, the places, the timeline, and what each character knows at each point.
- While writing, each chapter is drafted from that record and the chapters before it, then checked against both.
- At the end, the finished book gets a continuity read-through before it's marked done.
It isn't perfect, and you should still read it as an editor would. But you'll be fixing a draft, not untangling one.
Point of view
Choose your point of view
- First person
- "I" telling the story. Intimate and immediate; the reader only knows what the narrator knows.
- Third person limited
- "She", close behind one character's eyes. A familiar choice for genre fiction, and easy to keep consistent.
- Third person omniscient
- A narrator who can see into everyone. Suits sweeping fantasy and family sagas; harder to keep tight.
- Rotating limited
- Alternating chapters from two or more characters. Classic for dual-timeline mysteries and enemies-to-lovers romance.
You pick one in the app before PromptBook writes, and it holds to it chapter after chapter.
Compared
PromptBook, Sudowrite, Novelcrafter or a chatbot?
They're built for different jobs. This is our honest summary as of November 2026; check each product's own site for current features and prices.
| Tool | Best at | Where it's better than PromptBook |
|---|---|---|
| PromptBook | One brief to a whole drafted book in the background, with continuity checks and no step-by-step drafting; exports to EPUB, print PDF and Word. | (That's us.) Not built for writing alongside you sentence by sentence. |
| Sudowrite | Co-writing inside your own manuscript; its Story Bible and Draft tools can also draft chapters from an outline you build step by step. | Line-by-line co-writing and close, scene-by-scene control as you draft. |
| Novelcrafter | A writing workspace with a story database, where you choose the AI model. | Detailed control of every scene, and planning tools for writers who outline heavily. |
| A general chatbot | Brainstorming, quick scenes, talking a plot problem through. | Flexible and conversational, but you keep track of the story yourself. |
Length
A straight answer on length
A medium PromptBook is 10 chapters and about 27,000 words. That's novella length. Published novels are often 70,000 words or more, so treat the draft as a strong, complete first pass: add chapters, deepen scenes and let subplots breathe in the editor.
Writing a series? When a book is finished you can start a sequel from it, and the characters and world carry over.
From premise to finished draft
Pitch the story
Your hero, what they want, what is in the way. Pick the genre and the length.
Fix the plot first
Read every chapter beat before a word is drafted; move, rename or regenerate them.
Let it draft
Chapters are drafted in order and checked against what the story has already established: who knows what, and when.
Revise like an editor
Rewrite scenes, add chapters, then export an EPUB or a paperback interior.
Questions
How long is a novel written with PromptBook?
Short is 5 chapters (about 13,000 words) and takes roughly 30–60 minutes to write; medium is 10 chapters (about 27,000 words) and takes about 1–1½ hours. The longer length is novella-sized; you can add and expand chapters in the editor.
Will it write in my style?
You can describe the style you want (pace, tone, authors it should feel like) and give it samples of your own writing as reference material when you plan in the app. It will still sound like a draft, so expect to revise for voice.
Can I change the plot before it writes?
Yes. You see the whole chapter plan first and can rename chapters, change what happens in them or regenerate the plan before a word of the book is written.
Can it write a series?
Yes. When a book is finished you can start a sequel from it, carrying the characters and world forward.
Is it free?
The chapter plan on this page is free and needs no account. Free accounts can start 1 new book a month and keep 1 saved book, with EPUB, PDF and Word export. Basic ($9.99/month) allows 5 new books a month and Pro ($29.99/month) allows 10 new books. Deleting a book does not give the month's allowance back.