ProselonAn AI for novelists that can read and write your whole story.
Proselon is a writing application that allows you to write your story in your words. When you're ready, its first-class fiction AI can read your whole story bible, draft in your voice, and edit to perfection.
Structure your story however you like. The co-writer can read it.
You don't need to use our character forms or pre-filled templates. You already have a writing method that works for you. Proselon's co-writer adapts to your writing method, reading any page of your manuscript or story bible on demand, so you can write the way you want. Which is how it should be, really.
The co-writer can open any chapter, any scene, or any bible page the moment it needs one. When necessary, it will even read your entire manuscript before venturing an opinion.
Characters, locations, plot, world, style, research. A home for whatever your particular story needs. There are templates, but they're starting points you can modify however you like.
The co-writer keeps a running record of what is true, checked on request and carried across every book in the series, so a contradiction is flagged before a reader ever finds it.
When chapter one is already published and cannot be retconned, lock it so the co-writer never modifies it. The co-writer will use this as an unquestionable source of truth for future drafting.
Continuity you don't have to track.
Proselon's co-writer keeps a continuity ledger for you, so you don't have to interrupt your flow just to update a markdown checklist of continuity line-items.
Kept beside the plot rather than inside your head: facts, promises and reveals, each with the chapter where it was established.
When a book clears its whole-book read, the series plot is rewritten against what that book became, and the next volume is raised from a shape to a full plan before any of it is plotted.
First class story context management.
What determines the quality of AI fiction is what you load into context. Proselon handles this by loading high-signal low-noise artifacts into its agent's window.
- Framework
- 100,000
- Project canon
- 46,000
- Voice corpusprose
- 60,000
- Book and chapter canon
- 25,000
- Scene plan and sheets
- 34,000
- Preceding scenesprose
- 75,000
- Headroom
- 60,000
Why not paste in the whole book?
LLM retrieval suffers from something called a “lossy middle,” which means when a model has a lot in its context, the content in the middle is retrieved less often. But the middle is where most of a pasted book lands. And that’s not what the agent needs anyway; what it needs is plot information, style guidance, and continuity logs, not reams and reams of prose. So Proselon sends the scene, its neighbours, and the pages that govern them, and leaves the rest on disk.
Why no RAG?
RAG answers a question by searching an index of the book and handing the model the fragments that scored highest on likeness. But for fiction, the context surrounding the fragment is just as important as the fragment itself. And it creates a chore: an index is a second copy of the book, stale the moment you edit, and time and tokens have to be spent keeping it fresh. Instead, Proselon uses the manuscript as its only source of truth — never stale, always with the context it needs.
Seven editing passes on every book.
Fiction gets its own run of them, each in a fresh context, and the agent that edits is never the agent that drafted. So the editor never grades its own work.
Once every scene carries a draft, one pass reads the whole book for the constructions it keeps reaching for and recommends them for your Anti-Pattern Corpus. It edits nothing. The entries you approve are what the drafting screen and the line assessment then hunt for.
Each scene read cold against the plan it was drafted from. Does it earn its place, does the emotional arc land, does the internal conflict register. The pass returns findings rather than edits, and says whether the problem is structural.
Every drafted scene is rewritten wholesale against your voice corpus, by a different model than the one that drafted it. Diction, rhythm and imagery are open. Events, facts and what any line of dialogue means are fixed.
A fresh reader works the scene against your style guide and your anti-pattern corpus, cataloguing what each sentence does wrong. It returns findings and a verdict, and never touches the manuscript itself.
Names, dates, wounds and promises, measured against that book’s own Story State ledger, one rolling record per volume seeded from the one before it. This is also what confirms the voice rewrite left the facts where it found them.
Grammar, punctuation, spelling, and the consistency of every name and in-world term, with your own standing conventions winning over the machine’s preferences. Then one final readthrough for snags.
Two readers at once. One loads the manuscript and nothing else and reports where it sagged and what it saw coming. The other holds the plot, the themes and the ledger. Publishing does not begin until they clear it.
The eight steps, in order.
Proselon's co-writer develops a book in eight steps, arranged in the order that produces the best results. This starts at a high level, with your story's plot and themes, then the world it takes place in, then the style it's told. These are used to drill down through book, chapter, and scene outlines. Then drafting begins. After that comes several rounds of revision. Last is a publishing agent to walk you through distribution, wherever your story lives.
These steps are a framework for the AI co-writer, not a checklist you must march through. Skip straight to drafting if that's what you want to do!
Getting Started
The co-writer gets to know your story, what it is about, the feeling you are after and who it is for, and then sets sensible opening defaults for a book of that kind. Every one of them is yours to change.
Plot, Themes, and Conflict
The large shape first. Premise, arc, the major movements and the threads that carry from one book to the next. Then what the story is about beneath that, which is to say its themes, the central outer conflict, and the inner one each character is carrying.
Worldbuilding
Every person and place the plot has committed to acquires a page of its own. The co-writer asks what you already know about each, whether that is everything, a little, or nothing whatever.
Style and Voice
How the prose ought to sound. Point of view, tense, sentence style, vocabulary, and the things your narrator would never say. Then the model passages, which demonstrate the voice instead of describing it.
Outlining
The plot worked out at every level, from the arc of the book down to what belongs in each chapter and a specific plan for every scene, all of it stress-tested before a word is drafted.
Drafting
The co-writer works prose from the scene plans you have approved, held to your style guide throughout, one scene at a time.
Editing
Anti-patterning across the finished draft, then developmental notes, a voice rewrite, a line assessment, a continuity check and a copy edit, and last a whole-book read before anything ships. The agent that edits is not the agent that drafted, so the editor never grades its own work.
Publishing
Title selection, the store listing with its blurb and categories and keywords and author bio, cover, ebook formatting, and then the walkthrough that takes you live. Pricing, royalties, upload.
An agent just for publishing.
Once your manuscript is done, you still need formatting help, a cover, and a blurb. The co-writer, who by this point knows your book back to front, helps you write blurbs and listings, and provides prompts for you to use with image generators to get the cover you want.
| The step | What it does |
|---|---|
| TITLE RESEARCH | Comparable titles read from the store, and candidates tested against them rather than against taste. |
| STORE LISTING | Blurb, categories, keywords and author bio, written to the listing’s own conventions. |
| COVERS | Ebook and print cover briefs, sized to the trim and the spine your page count needs. |
| FORMATTING | The manuscript exports to Word. The co-writer walks you through your front and back matter, then through the formatting tool you pick — Vellum, Kindle Create or Atticus. |
| KDP UPLOAD | A walkthrough of pricing, royalties and territories, with the co-writer filling the forms alongside you. |
Powered by your favorite AI engine.
Proselon's co-writer is powered using whatever AI you want, from frontier models to custom local ones to BYOK.
API Key
Local Models
ChatGPT
Gemini
Grok
Claude
Only six dollars a month.
One product, with everything included on both plans. The only decision is how often you are billed, and you make it after the trial rather than now. Your AI subscription is billed separately.
- The AI co-writer, on all six engines
- Continuity across a whole book or series
- Automatic version history
- Export to Word, EPUB, and more
- Every theme, in a light half and a dark one
- No credits or meters
Your writing room is ready.
Thirty days free without a card. Then six dollars a month, on the Claude or ChatGPT account you already pay for, or a free local model that never leaves your computer.