01
Continuity
What changed?
- Did this room have a back door?
- Was the tide already turning?
- Was the altar stone cracked before this scene, or after?
Start writingNarrative Memory for Novelists
You write.
Prosa remembers.Then tells you what matters for the scene at hand.
Prosa reads your whole draft and keeps every character, place, and fact in view as you write — then flags what doesn't add up. No story bible to build, no re-reading, no continuity pass.
Your books are never used to train AI — not ours, not anyone's.
As seen in
Chapter 2 — The Mirror at Greycliff
The buried shrine
Aeryn climbed the last of the path to Greycliff, her apprentice Loa a half-step behind, where the headland dropped into a hanging valley no one had mapped in eighty years.
She set the brass quadrant down on the altar stone, her sea-grey eyes narrowing against the glare, and knelt to read the tide her mother, Tessa, had never learned to trust.
Loa hung back at the treeline, quick where Aeryn was exacting, her ink-stained fingers already moving — she had followed Aeryn out of the cartographers' guild two winters ago.
She worked in charcoal now, racing the light that was already going copper over the water, getting the headland down before it failed. Whatever Aeryn read in the tide, Loa would have it drawn.
Brevin, her husband, would be back by dusk with the boat; until then the tide-charts were theirs alone — Aeryn's to read, Loa's to draw, and neither of them willing to leave the valley uncorrected another winter.
Supported By
Notion
What our early users are saying
Prosa is such a helpful tool for my ADHD writer brain. It picks up so many details that I forget myself. I've tried so many of the writing software out there and I find Prosa to be both straightforward as well as not the bare minimum. I've been way more confident writing scenes now that I know there won't be details that I may be missing. The best part of it is definitely that it's still your writing and that the dev team is so responsive when you need help.
Incredibly useful! …a “memory-bank” that flags when I remember things wrong is a god-send. Super useful to have one centralised app instead of 5+ different solutions. 10/10!
[Prosa] helped me catch things I needed to fix or improve immediately, even in its very early stages. It stands to be a game-changer for the industry.
the problem
The longer the draft, the more fragile it is to change.
Change one thing early, and it ripples to the last page; readers notice what slips. So you write more and more cautiously — guarding what works instead of chasing the better idea, every change dragging you back through the same few questions.
02
Cast state
Who is here?
- Is Brevin back yet, or still out with the boat?
- When and where was Loa last seen?
03
Names & aliases
Who is this again?
- Is ‘the apprentice’ Loa now, or Aeryn back then?
- Have we spelled it Aeryn, or Aerin?
- Is ‘Coldwater’ the mother, or the daughter?
04
Objects & places
Where did it go?
- Was the letter in her coat, or the drawer?
- Did she leave the brass quadrant on the altar stone, or take it?
- Is the hanging valley two days from Greycliff, or three?
05
Backstory
What was promised?
- What did she confess two books ago?
- What did Loa swear when she left the guild?
- Whose debt was Aeryn still meant to repay?
06
Series
Does it still match book one?
- Was her scar on the left wrist, or the right?
- Has the tide always turned at dusk?
- Was the crossing three days last book, or four?
Prosa answers all six.
The solution
Write to explore, not to avoid mistakes.
Prosa keeps the answers within reach — what's true, who knows it, where it appeared, and what changed — so you can follow an idea instead of writing scared.
Under the Hood
Meet Shepherd.
Shepherd is the engine behind Prosa — built and refined over months with real authors. It reads an entire manuscript, works out the whole cast across hundreds of pages, and holds your story as one connected model it can check for consistency — engineered to work at the scale of a novel. It reads; it never writes.
Your manuscript
Aeryn had her mother's eyes. Tessa was twenty years dead, but the sea-charts she drew still hung in the workshop, and Aeryn read them the way other people read scripture.
Old Halloran had trained her since she was a girl — taught her to feel a coastline in the dark long before she was ever allowed to draw one in the light.
Now Aeryn taught the same trade to Loa, her apprentice, who learned the knots and the bearings faster than she would ever admit to her face.
She had married Brevin at Greycliff, in a chapel that smelled of salt and pitch; he kept the boat, she kept the maps, and for a while that was enough.
Marsala had ridden at her side through all of it, a sworn ally since the guild years — right up until the pass above Tindel, where Marsala turned on her and took the charts for herself.
Reads the whole draft
Every chapter, end to end — not a sampled excerpt or a chat window's worth of context.
Works out the story
Who's present, where a scene sits, what's true as of this page — resolved across the entire manuscript.
Links every fact to its source
Each detail it remembers points back to the passage that proves it, so you can always check the work.
Our philosophy
A Prosa novel is a human-written novel.
Prosa supports the writer's judgement, memory, and craft. It helps you understand and strengthen the manuscript you wrote.
It does not generate chapters or imitate your voice, and it doesn't replace editors or stand in for revision.
Storytelling is a human art form. Everything Prosa does is in service of keeping it human.
Your sentences stay yours. Prosa generates nothing — not a chapter, not a manuscript title, not character art.
It's never used to train AI models — not ours, not anyone's — and your work stays private to your account, bank-grade encrypted and GDPR-compliant. Export everything, anytime.
Everything Prosa remembers points back to the passage that proves it. You can always check the work.
Questions, answered
Before you hand Prosa your manuscript.
01Will Prosa write or change my words?
No. Prosa reads what you've already written and keeps track of it — the cast, the facts, the continuity — so you don't have to hold the whole book in your head. It never drafts, rewrites, autocompletes, or suggests a single line. The writing stays the writer's.
02Does Prosa use AI?
Yes — our own AI models, and only to read, never to write. They handle the comprehension: the natural-language processing and information extraction that let Shepherd read your prose and pull the cast, the facts, and the relationships into a structured record. That's how it follows any genre or voice, even a rough draft thick with typos and shorthand. The models are aimed entirely at understanding your book; they never generate, rewrite, or alter your prose.
03Do you use my manuscript to train AI?
Never — not for our models, not for anyone else's. Your book is not training data. It stays private to your account.
04How safe is my unpublished work?
Your manuscript is bank-grade encrypted and private to your account, and Prosa is fully GDPR-compliant. It's your book, and we treat it that way.
05Can I get my work back out if I leave?
Always. Export your manuscript along with everything Prosa keeps around it — characters, facts, continuity — whenever you like. Nothing is locked in.
06Does it work across a whole series, not just one book?
Yes. There's no limit to how large a manuscript — or a whole series — Prosa can hold; a detail you set three books ago is still at hand, and still consistent, in the one you're writing now. The only cap for now is a weekly limit on how much new writing it analyses.
07What does it cost?
$15 a month during the pilot — and that reads your whole book, up to 150,000 words of fresh analysis a week. For context, a continuity pass from an editor runs $1,000–3,000 a book, and a single slip that reaches readers can dent a series; Prosa keeps your continuity in view across every draft for a fraction of that. Cancel anytime, and your manuscript is always yours to export. Different pricing will apply when we launch publicly, with plenty of notice for pilot writers before it does.
Ready when you are
Write forward without carrying the whole book in your head.
Bring the manuscript you're already writing — Prosa keeps the cast, the facts, and the continuity straight, for this book and the next. It reads your story; it never writes it.
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