AI book writer
Write a book with AI, starting with your chapter plan.
Describe your idea. In a minute or two you'll see a chapter-by-chapter plan for it, free and without an account. Like it? PromptBook writes the whole book.
- Fiction or non-fiction, 5 or 10 full chapters
- Names, facts and timelines checked chapter by chapter
- Edit it, design a cover, export EPUB, PDF or 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 a chapter PromptBook wroteYour 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.
Read what it writes
A novel opening, unedited
PromptBook wrote this fantasy novel from the one-paragraph brief below. No person edited it.
In the canal city of Veyra, where glass lanterns hold the memories of the dead, apprentice lantern-keeper Sera Vale discovers someone has been stealing memories, including the last memory of her murdered mentor.
The evening bell found Sera Vale on her knees at the foot of the Ninth Lantern, polishing the black stone dais with a rag gone soft from forty years of other apprentices' hands. Three fathoms of ribbed glass rose above her, filled with a light that was not quite gold and not quite white, and as the bell's sixth stroke rolled through the Hall of Lights and died, that light shivered, the way it always did when the tide turned beneath the city.
Corvin was late.
In three years of apprenticeship, Magister Corvin Hale had been late for rounds exactly never. He was the man who arrived before the bells to warm the wax, who counted the galleries the way other men counted coin. Sera sat back on her heels, looked down the long sweep of the first gallery (lights in their thousands hanging in tiered niches along the curved walls, each one a life, each one burning) and told herself the tide had held him up on the seaward stairs.
From idea to finished book
Describe your idea
A sentence or two. Pick the type of book and a length.
Approve the plan
See every chapter before anything is written. Rename chapters or regenerate the plan.
PromptBook writes it
Each chapter is written, then checked against what came before. Close the tab; we email you when it's ready.
Edit and export
Polish it in the editor, design a cover, then export EPUB, print-ready PDF or Word, or share a reader link.
Questions
How long does it take to write a book with PromptBook?
The plan takes a minute or two. 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. It runs on our servers, so you can close the tab. We email you when it's ready.
Is the AI book writer free?
The chapter plan 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.
Will the book be consistent from start to finish?
That's what PromptBook is built for. Before writing, it records the facts of your story: who's who, what happened when, and what each character knows. Every chapter is checked against those facts and against the chapters before it, and the finished book gets a final continuity read-through.
Can I edit the book the AI writes?
Yes. Every chapter opens in an editor where you can rewrite, expand or shorten passages, reorder chapters, design a cover and export an EPUB or a print-ready interior PDF. Under our terms your content is yours, and you're responsible for reviewing AI-written text before you publish it. Amazon KDP asks authors to disclose AI-generated content.
What kinds of books can it write?
Novels (romance, thrillers and mysteries, fantasy, science fiction), memoirs, self-help, business and educational books, in 9 languages. There's also a separate illustrated picture-book mode for children's stories.