The team in your head, made real.

Every writer carries a cast of collaborators — the world-keeper, the brainstorming partner, the character who won't stop talking. AuthorBuilder makes them real, tireless, and always available.

Built for fiction writers who take their craft seriously.

Chaos Writing

“Write messy. We'll sort it out.”

Brainstorm in Chat with an AI partner that listens, responds, and files what you settle on into your Story Bible. Ramble about plot twists at 2am. Explore character backstories out loud. Your creative chaos becomes structured, searchable knowledge — without you organizing a thing.

Story Bible

“Your world, searchable and alive.”

Track every character, location, and world rule in one place. It fills in from your chats as you brainstorm, so your world keeps growing while you think out loud.

Prose Editor

“AI that follows your voice, not the other way around.”

Drafting that knows your characters, your plot, your tone. Continue where you left off. Rewrite passages that aren't working. Expand sparse scenes with the detail they need. Your edits are law — the AI adapts to you, never smooths over your choices.

Character Roleplay

“Talk to your own characters.”

Interview them. Test dialogue. Explore how they'd react to a plot twist. They answer in their own voice, drawing on the personality, speech patterns, and history in your Story Bible, and speak from what they'd plausibly know.

Your writing tool shouldn't read your diary.

AES-256-GCM encryption at rest for all your creative content
Your work is never used to train AI
No real name required — just an email to sign in
Export any project's chapters and Story Bible, anytime

Join the founding authors.

We're building this with a small group of writers before opening the doors. Get early access, shape the product, and be the first to use it.