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Continuity-first writing

Write fearlessly. Bunsho keeps your story consistent.

A writing app that remembers your whole book. Ask for a check and it tells you where a chapter contradicts an earlier one, with both passages quoted, before your readers find it.

Download for macOSDownload for Windows

Free editor. No account, no card. Open the sample story and see what a finding looks like before you import a word of your own.

The Bunsho editor: binder on the left, the manuscript page in the middle, the Director panel on the right
Bunsho for macOS and Windows

Built for novelists, plotters, and discovery writers who care deeply about story logic and continuity, not just pretty sentences.

Remembers the whole bookBoth passages quotedFree to download, no account needed

Screens

Write, plan, keep the bible, check. One project.

  1. 01

    Editor

    Binder, page, and your story at your side. Nothing is metered while you type.

    The Bunsho editor: binder on the left, the manuscript page in the middle, the Director panel on the right
  2. 02

    World

    Characters, places, and objects, read out of your prose.

    The World tab listing characters, places, and objects read from your manuscript
  3. 03

    Planner

    Chapter cards with what each one is meant to do.

    The Planner with chapter cards and their intents
  4. 04

    Continuity

    Ask for a check. Every contradiction arrives with both passages in view.

    The Continuity panel showing a flagged contradiction with both passages in view

Why writers choose Bunsho

What happens when you ask for a check

Three steps, every time, and only when you ask. Nothing runs while you type.

The Letterch9 · 3 entities linked
9The Letter

Selma set the onionskin letter on the table and pushed it across. Mira read it twice, the second time slower, then folded it into the pocket of her father's coat.

ContinuityDirectorWorld
Linked on this page3
Story model
Mira is Devan's daughter. Devan has been dead since Ch. 2. The coat inherits his last known location: the Corver house.
ch2 ¶8 · devan
New object
Onionskin letter, first appearance. Tracked from here forward.
ch9 ¶1 · letter

When you are stuck

Direct the scene. Bunsho keeps your characters honest.

@-tag anyone in your cast, describe what happens next, and Bunsho drafts the scene as a beat sheet you approve, checked against everything your characters already know before a single word of prose is written.

Preflight runs before the prose. Contradictions with what a character knows surface as notices on the plan, not as sentences you have to unpick later.

Every beat is yours to accept. Rendered prose sits on the page it would join, with Accept, Re-render and Discard in reach, and its cost in plain numbers.

How Director Mode works

DirectorWorldContinuity
Corver kitchen, nightplanned
Mira learns her father knew about the crossing.
3 beats · cast: mira, selma · ch12
PreflightMira does not yet know Devan was on the boat. Beat 2 assumes she does.
Selma is in Sorren Point until Ch. 14.
beat 1 · slowaccepted
Selma lays the onionskin letter on the table and pushes it across.
↳ The secret is physically in the open.
beat 2 · steadyrendered
Mira reads it once. No tears: stillness, then the cold voice.
↳ Grief converts to resolve.
+knows mira:devan-knew
+state mira:resolved

She read it once, and did not read it again. “You knew,” she said. It was not a question, and Selma did not answer it as one.

AcceptRe-renderDiscard~180
beat 3 · quickplanned
Mira decides: they cross to Corver.
Render~180
colder, and cut beat 2’s dialogue @mira→
Factual2Timeline1World1
FactualArvind's age contradicts Ch. 3Error
This pagech12 ¶1
“Arvind was twenty-two that winter, still too young to remember the crossing.”
Contradictsch3 ¶4
“Twenty-seven, and already the oldest thing in the room.”
ResolveDismissarvind.age
TimelineThree days here, a week in Ch. 14Warning
WorldThe coat was last in the Corver houseHint

Continuity view

Every finding shows its evidence.

When you ask for a check, Bunsho reads the chapter against everything your book has already established and reports only what contradicts it.

Every finding shows both passages in your own words, the exact coordinates, and what your story has already established about that character. No score, no grade: Bunsho reports facts and leaves the judgement to you.

CharactersTimelineWorld rulesObjectsPlaces
Inside the continuity checkerThe five plot holes readers actually catch

Founder story

Why I’m building Bunsho

I’m a novelist and a builder. While drafting my own book, I realized every AI tool helped me rewrite sentences, but none helped me keep the story consistent.

I was constantly flipping back to check character details, timelines, and world rules. I kept spreadsheets, sticky notes, and docs… and still missed things.

Bunsho is my attempt to fix that: a writing app that remembers the whole book and checks it when you ask, so you can focus on the story, not the tracking. Bunsho is Japanese for prose.

Koundinya G

Pricing

The editor is free. AI is what you pay for.

Writing is never metered. Credits buy deliberate AI moments: a chapter check, a full review, a directed scene.

  1. 01Free

    One project. World and Planner included, plus starter AI credits to try the continuity checker and Director.

    $0
  2. 02Quill

    Unlimited projects. The full editor, World and Planner, with no AI.

    $8/mo
  3. 03Storyteller

    Everything in Quill plus the continuity checker. Enough each month to read a full novel and check about 90 chapters after that.

    $15/mo
  4. 04Saga

    Everything in Storyteller with about 250 chapter checks a month, for daily drafting and series work.

    $29/mo

Prices in USD. Cancel any time. The editor stays free with no account.

Questions from fellow writers

FAQ

What exactly does Bunsho do?

Bunsho is a writing app that remembers your whole book: every character, place, event and rule you commit to the page. When you ask for a check, it tells you where a chapter contradicts what the book has already established, with both passages quoted.

Is this an AI that writes my book for me?

No. Bunsho is not a ghostwriter. It’s a continuity and consistency assistant that helps you keep your story logically sound while preserving your own voice.

How do I get Bunsho?

Download it for macOS or Windows from this page. The editor works with no account. Sign in when you want the AI features.

Will my manuscript be used to train AI?

No. Your manuscript lives on your machine, not on our servers. Pages are sent for analysis only when you run a check, and they're never stored or used for training.

Is Bunsho free?

The editor is free to download, with no account. The AI features (the continuity checker and Director Mode) come with starter credits on the free plan, and paid plans add a monthly allowance. See Pricing.

Does Bunsho use AI?

Yes. Bunsho uses AI to maintain a persistent understanding of your manuscript and detect continuity issues when you run a check. In Director Mode, it can also draft prose for a scene you direct, but only as a beat sheet you approve first, checked against everything your characters already know before a word is rendered. It never rewrites your existing manuscript without your say-so.

Ready to check your book?

Free for macOS and Windows. Open the sample story, run one check, and see what a finding looks like before you import a word of your own.

Download for macOSDownload for Windows