Tell us your story.
We’ll write the first chapter.
FictionOS writes long fiction in your voice — chapter by chapter, with memory that holds across a 90,000-word book.
In your voice.·In about 90 minutes.·Yours to keep, forever.
voice studio · live demo
The same scene, in any voice.
Upload three pages. FictionOS writes every chapter the way you would.
the rewrite
voice match · 0.94“She found him in the mirror before she found him in the room, and that was the way it had always been with Cal. He was nursing a whisky he wasn’t drinking. When his eyes lifted to hers in the glass he did not pretend he had not been looking, and that, she thought, was the trouble with him. He never gave her the small mercy of pretending.”
raw LLM said: “She walked into the bar and saw him. He looked up and their …” (expand)
“She walked into the bar and saw him. He looked up and their eyes met. Her heart raced.”
what happens after you click write
About ninety minutes of work, fully shown.
live — chapter 1 in progress
output — chapter 1, opening
Frank had been retired thirty-one years when his daughter knocked on the door. He knew it was her before he opened it—not because he’d been expecting her, but because nobody else came up the back stairs.
She set a manila folder on the kitchen table the way you set down something that might bite. She didn’t sit. He didn’t offer.
the proof, in your genre
What the polish pass actually changes.
the rewrite
“She found him in the mirror behind the bar before she found him in the room. He was nursing a whisky he wasn’t drinking, watching the door the way a man watches the weather. When his eyes lifted to hers in the glass, he didn’t pretend he hadn’t been looking. That, she thought, was the trouble with Cal Renwick. He never gave her the small mercy of pretending.”
raw LLM said: “Her heart pounded as their eyes met across the crowded ballroom. She f…”
“Her heart pounded as their eyes met across the crowded ballroom. She felt a wave of butterflies. He was the most handsome man she had ever seen.”
six gates every chapter passes
What we promise on every page.
The point isn’t that an AI can write your book. It’s that, on every page, it has to write it like you would — or it doesn’t go through.
Voice fidelity
Voice Studio learns your rhythms from 3–10 of your pages. Every draft scored. Below 0.85 → pipeline rewrites until it matches.
No AI fingerprints
146 clichés we won’t let through. Filter words removed. Telling rewritten as showing. The flat prose that gives AI fiction away — gone.
Memory across the book
Memory Surgeon tracks every character, relationship, and plot thread across 30+ chapters. Promises made in chapter 3 pay off in chapter 27.
Open-door, dark themes, anything
No content lectures. Configure spice level, violence, dark themes per project. It’s your book.
You own everything
Every word, every draft, every iteration. We never train on your work. No claims, no licensing, no marketing without permission.
KDP-ready disclosure
Built for the AI-assisted disclosure path. We help you label correctly so Amazon, Kobo, and Apple Books accept the work.
cost calculator
Books in a year, not dollars per word.
you save, per year
and you get back
1Industry low end. Reedsy 2024 ghostwriter survey: senior ghostwriters quote $0.10–$0.30/word for original fiction; $0.04 is the entry rate for inexperienced freelancers on Upwork. The savings figure assumes you hire cheaply.
Price by the books you’ll ship.
BYO Anthropic key. We never mark up usage. Cancel any time.
Starter
- ✓Voice Studio
- ✓All quality gates
- ✓All Anthropic tiers
- ✓Export to DOCX
- ✓100% writer-owned
Creator
- ✓Voice Studio
- ✓All quality gates
- ✓All Anthropic tiers
- ✓Export to DOCX
- ✓100% writer-owned
Pro
- ✓Voice Studio
- ✓All quality gates
- ✓All Anthropic tiers
- ✓Export to DOCX
- ✓100% writer-owned
Studio
- ✓Voice Studio
- ✓All quality gates
- ✓All Anthropic tiers
- ✓Export to DOCX
- ✓100% writer-owned
Studio teams & small presses → contact us for seats & volume
a letter from the founder
The toast was on purpose. The cardigan was the problem.
Roubaix, March 2025
The fourth novel I tried to write opens on a Tuesday in November, in a kitchen in Roubaix, with a woman named Édith burning toast on purpose. I have rewritten that scene one hundred and eleven times. I know what she is wearing. I know which of her two husbands is upstairs. I know what the dog is called. I have not been able to make it sound the way it sounds in my head for nine years.
The first three novels are in a banker’s box in my mother’s attic. The third one sold ninety-one copies. I know exactly who bought twelve of them. Two are my aunts.
I built FictionOS because the gap between what a sentence sounds like in your head and what it sounds like on the page is the whole job, and the whole job almost killed the only thing I have ever wanted to do. It is not a chatbot. It is the editor I could not afford, the agent who would not return my emails, and the part of myself that knows what Édith is wearing when my hands are too tired to find the words for the cardigan.
I am still working on the fourth novel. It will be done when it is done. Until then, this is the workshop I wish someone had handed me the night I started — and the burnt toast on the counter when I sat back down.
So — what’s the story?
The first chapter is on us. No card. Yours forever, whatever you decide.
Write your first chapter — free →