AI that writes in your voice,
not its own.
bookmoth is the only AI desktop writing app that learns your prose at the sentence level, then drafts in your voice, scene by scene,
while you steer.
bookmoth is the only AI desktop writing app that learns your prose at the sentence level, then drafts in your voice, scene by scene,
while you steer.
“Every AI writing tool I tried produced text that sounded like AI. Competent, clean, utterly lifeless. I built bookmoth because I wanted a tool that could learn how I actually write, then stay inside those constraints on every sentence.”
Stu, founder
Both written by Claude Opus 4.6. The only difference is that the right one was governed by the writer's own voice profile.
Brief. Voice. Plan. Draft.
A guided conversation draws out your premise, characters, tone, and emotional arc. The richer this is, the better everything downstream becomes.
Paste in your own prose. bookmoth analyses your sentence rhythms, dialogue patterns, and vocabulary at the mechanical level, then compiles it into a writing profile that governs every draft. Not just English: it works across major European and Asian languages too.
Every chapter breaks down into scenes, each with its own goal, conflict, and turn. Generate a plan from your brief, paste in an outline you've already written, or import an existing manuscript. Change the plan and the manuscript follows. Change the manuscript and the plan stays in sync.
Each scene drafts with full awareness of what came before and what comes next. Polish a single scene, run another pass on the whole chapter, or start a new version without losing anything. Choose your model: Anthropic, OpenRouter, or a local LLM.
Paste a few paragraphs. Get a free voice portrait by email. No account needed, no strings. Just an honest editorial read of your prose. Works in most major languages.
Get your voice portrait
See it work
Ask the Editor reads your chapter in the context of your entire manuscript, your brief, and your voice profile. Structural, tonal, and craft-level notes.
Every chapter carries its own versions. Draft, revise, start fresh. Your earlier work is always there. Nothing is overwritten, nothing is lost.
No account. No cloud. No analytics. Your manuscript, your brief, your writing profile: all stored on your machine.
One fee. No subscription. Ever.
Bring your own API key (Anthropic or OpenRouter). A chapter costs anywhere from 2 to 30 cents depending on your model. You control your spend.
You buy bookmoth once. Updates are free, forever. No tiers, no usage caps.
AI costs are between you and your API provider. A chapter costs anywhere from 2 to 30 cents depending on the model: Claude sits at the top end for maximum quality, OpenRouter models bring it down to a few cents, and local models are free. You see exactly what you spend in your own dashboard.
Most AI writing subscriptions charge $19-29/month. In three months you've spent more than bookmoth costs forever.
$49. Once. No subscription. Free updates forever.
