Genre fiction has rules readers care about — fair-play clues in a mystery, clear progression in a LitRPG, the beats of a romance. Book Factory lets you set those rules once in a direction note, and every outline and chapter is written against them.
You shape the premise, the cast, and the voice. The AI drafts chapters and runs checks for continuity and scene craft, and you edit until it reads like your book.
Free plan: $4 of AI writing included — about 40 chapters — and no API key needed.
Real screen recordings of the product.
Choose fiction, enter the premise and genre, who the readers are, and a direction — for example, "cozy small-town mystery, wry first-person narrator, low gore, slow-burn romance subplot, fair-play clues." You get a chapter-by-chapter plot outline to rework.
Each chapter drafts from its outline entry, the story so far, and your direction. Edit in the built-in editor or regenerate with notes like "more dialogue, end on the reveal."
Run continuity and scene-craft checks, fix what's flagged, and build a Kindle-ready EPUB or a paperback interior.
Each time a chapter is written or saved, it's scored by Jev, a fast judge model from TypeSafe, against a fixed bank of questions for its book type — plus a continuity pass that reads it beside the chapters before it and checks it against the facts they established. Findings flow straight into the editor pass as concrete fixes.
No problems flagged.
Style issues flagged, each with a specific fix for the editor pass.
A high-confidence blocking problem — the book won't pass the publish-ready check until it's fixed or you override it as a labelled draft.
Chapter verdicts roll up into checks no single chapter can answer.
A single book grade in the Quality tab — withheld, with the reason, until enough of the book has been measured to mean something.
For fiction and non-fiction. High-confidence problems block the final build; you can answer a finding back with your reason, and a build that goes ahead on one says so.
Facts, names, and events checked against everything earlier chapters established — plus numbering, cross-references, and a real ending.
Totals, balances, and percentages are recomputed, so a figure that doesn't add up gets caught instead of printed.
For non-fiction: does the book build toward something, are the chapters in a defensible order, is anything missing or said twice. Advice, not a gate.
Every chapter also gets a slop score: how densely it uses the words and phrasing machine prose overuses, built on the open-source slop-score lists behind the EQ-Bench creative-writing leaderboard.
Series-friendly genre fiction with clear reader expectations is where a direction note does the most work.
LitRPG readers notice when the system doesn't add up. Put the rules in your direction note — class, stat and skill rules, how the protagonist levels, and how often system messages appear — so chapters stay consistent. Then check progression in the continuity pass and in your own read-through.
Beyond grammar, fiction needs to hold together. After each chapter, Book Factory records the facts it establishes — who's who, where things are, what already happened — and the Jev judge checks the next chapter against every one of them. It also flags flat dialogue, scenes that change nothing, and machine-writing tells like stock similes.
Look for a tool that keeps system rules and progression consistent across a whole book, not just a single chapter. In Book Factory you define the rules once in a direction note, draft chapter by chapter against a plot outline, and run continuity checks — then fix anything that breaks the system in the editor.
It can draft one, chapter by chapter, from an outline. Turning that draft into a novel people want to finish still takes your editing — tightening scenes, sharpening dialogue, and making the twists land.
A chapter draft is typically a few thousand words, following that chapter's outline entry. You can ask for shorter or longer chapters in your direction or regeneration notes.
Yes. The Free plan includes $4 of AI writing — about 40 chapters, or roughly three typical books — with every feature and export format and no API key needed. If you use it up, you can add your own Anthropic key in Settings and keep writing. A Pro plan is coming soon.
You do. Your books are private to your account, Book Factory does not train on your content, and you can export everything at any time and publish it wherever you like.