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Write still.

Hearn is the writing app for novels, scripts and everything else you keep track of. One calm page for the manuscript, one Codex for the world behind it.

Free to start. No account needed. iOS and Android are coming soon.

The Hearn editor open on a story, with the chapter list and Codex in the sidebar and a hover card for a linked entry.The Hearn editor open on a story, with the chapter list and Codex in the sidebar and a hover card for a linked entry.

A page that gets out of the way.

The editor is quiet on purpose. Type, link and keep going. Hearn saves as you write and keeps every version, so nothing you wrote is lost.

  • Saved, always

    Every change is stored on your device first and synced when you are online. Open the history to see an earlier version and compare it with today’s.

  • Type [[ to link

    Mention a character, a place or a note and Hearn links it, underlined in the colour of its kind. Your own words stay plain ink.

  • Built for long work

    Chapters, parts, front and back matter, word and character counts, a focus view, and a teleprompter for scripts and video.

Hearn on a phone: the same project, one column.Hearn on a phone: the same project, one column.

Everything in your world, one link away.

The Codex keeps your characters, places, objects, lore and research as entries that link to your pages and to each other. Open any entry and see everywhere it appears.

Eight kinds, eight colours, the same in every project.

  • People
  • Things and time
  • Notes and ideas
  • Places
  • Sources
  • Structure
  • Worlds and themes
  • Bonds and feeling

, a blind biwa player, lived at , where the priest gave him food and lodging for his music. On calm nights he recited the fall of the at , and the sea itself seemed to listen.

Hover, focus or tap a name.

People

Hōïchi

A blind biwa player, renowned for reciting the history of the Heiké. He makes his home at Amidaji, where the priest offers him food and lodging in return for his music.

Appears in

  • Amidaji
  • The Heike and Dan-no-ura
A Codex entry for a character in Hearn, showing its description and the pages and entries where it appears.A Codex entry for a character in Hearn, showing its description and the pages and entries where it appears.

Write in any language, set the way it should be.

Hearn’s interface comes in 11 languages and you can write in more. Japanese and Chinese get proper fonts, ruby and vertical writing. Arabic runs right to left. Linked translations keep two versions of a chapter side by side.

A Japanese chapter set vertically in Hearn, with ruby over a word.A Japanese chapter set vertically in Hearn, with ruby over a word.
An Arabic chapter in Hearn, set right to left.An Arabic chapter in Hearn, set right to left.
  • Vertical writing

    Switch a Japanese or Traditional Chinese page to vertical (縦書き) and back. Ruby for furigana, counts in characters.

  • Right to left, properly

    Arabic pages, menus and punctuation behave the way a native reader expects.

  • Linked translations

    Translate a chapter into another language and keep the two versions linked, side by side.

Interface languages

  • English
  • العربية
  • Deutsch
  • Español
  • Français
  • 日本語
  • 한국어
  • Português
  • 简体中文
  • 繁體中文(香港)
  • 繁體中文(台灣)

Write with others, or send a link.

  • Ana ReyesOwner
  • Jun ParkWriting nowEditor
  • Sam OkaforReviewer
Review linkCopy link

The harbour was already awake. Gulls stood on the rail like clerks, waiting for the ferry to open its ledger.

Sam Okafor · Comment

“Clerks” is lovely. Could the next line say what the ferry is waiting for?

Sample project, sample people.

Invite a co-writer and see their cursor move as you both write. Send a review link and an editor can comment without making an account. Anyone can be invited to a project for free.

  • Real-time, with roles

    Owners, editors and reviewers each get what they need. Changes merge as they type.

  • Comments and suggestions

    Reviewers leave notes and suggested wording in the margin. You accept or decline each one.

  • Review links

    Share a chapter or a whole project with a link that you can switch off at any time.

Out into the world, in the format it needs.

Export a finished manuscript as EPUB, print-ready PDF (vertical too), Word or Markdown. Or publish straight from Hearn to Ghost or WordPress.

Formats

  • EPUB
  • PDF
  • PDF 縦書き
  • DOCX
  • Markdown
  • TXT

Publish to

  • Ghost
  • WordPress
Hearn’s export dialog: choose what to export, the format and layout, and see a live preview of the page.Hearn’s export dialog: choose what to export, the format and layout, and see a live preview of the page.

Marginalia checks your story against itself.

An optional AI editor that reads the whole project, not one page at a time. It looks for continuity slips, timeline errors, things a character should not know yet, wrong facts and anachronisms, and leaves a note in the margin. You accept or dismiss each one.

Chapter 3, Geneva, March 1985

Dr. Moreau chalked the constant on the blackboard: h = 6.62607004 × 10−34 J·s, the number her father had sworn would never change.

“And Ines,” she said, without turning around, “has already read the letter from Lisbon.”

Anachronism

That value is from CODATA 2014. In March 1985 the accepted value was 6.626176 × 10−34 J·s (CODATA 1973).

Source: CODATA recommended values of the fundamental physical constants, 1973.

Character knowledge

Moreau mentions the letter from Lisbon here. Ines receives it in Chapter 9, and nothing earlier shows that Moreau has seen it.

  • Reads everything

    Your manuscript and your Codex, together, so it knows who was where, and when.

  • Never writes unless asked

    It points; you decide. Drafting happens only when you request it.

  • Cites its sources

    Facts and dates come with a reference you can check.

Zero retention. No training on your writing. Nobody at Hearn reads it.

Marginalia is an optional add-on to Folio.

Read the AI policy

Wherever you write.

One project, on every device you own. Hearn works offline and catches up when you are back online.

  • Web

    Open now

    web.hearn.app
  • iOS

    Coming soon

  • Android

    Coming soon

  • Desktop

    Later

No account? Start in guest mode. Your writing stays on your device until you decide to sign in.

Simple plans. Start free.

Write for free, for as long as you like. Pay when you need to sync more, collaborate, export and publish, or add Marginalia.

Memberships are rolling out. This is how they will work at launch.

Free

$0

For finding your voice.

  • Guest mode: unlimited projects on your device, no account
  • Signed in: 3 synced projects, 500 MB, 7 days of history
  • Be invited to anyone’s project for free
  • Export to Markdown, text and Word
  • On-device writing assistant and teleprompter

Folio

$69.99/ year

Save about 27%

For a whole library of work.

Coming soon
  • Unlimited synced projects, 25 GB, 1 year of history
  • Up to 5 editors per project and review links
  • Linked translations
  • EPUB, PDF and vertical PDF export
  • Publish to Ghost and WordPress
  • Teleprompter remote control

Folio + Marginalia

$109.99/ year

Save about 29%

With an editor that reads everything.

Coming soon
  • Everything in Folio
  • Continuity, timeline, knowledge and fact checks
  • Margin notes you accept or dismiss
  • Codex-aware chat and whole-project audits
  • Zero retention, no training

Imprint

$119.99/ year per seat

For teams and small presses.

Later
  • Shared workspaces and seats
  • Everything in Folio + Marginalia
  • Coming later

Founding Writers

The first 1,000 writers to subscribe lock their price for as long as they stay: $49.99 a year for Folio, or $79.99 a year with Marginalia.

Prices are in US dollars; local prices vary by region and taxes may be added. Students get 50% off. Subscriptions renew until cancelled. Refund & Cancellation

Questions, answered.

Do I need an account to try Hearn?

No. Open Hearn and start writing in guest mode. Your work stays on your device. Sign in with an email code, Apple or Google when you want to sync, share or use Hearn on another device.

Where is my writing stored?

Signed-in projects are stored in Cloudflare’s network, with account data in a Neon Postgres database. Everything travels over encrypted connections and sits on providers that encrypt their storage. It is not end-to-end encrypted, because the service has to read your writing to sync, search, export and, if you turn it on, check it with Marginalia.

Does Marginalia use my writing to train AI?

No. Marginalia runs on Cloudflare Workers AI with zero retention, and your writing is never used to train models. It is optional, and nothing is sent to it unless you use it.

Can I take my work with me?

Always. Export to Markdown, text or Word on every plan, and to EPUB and PDF on Folio. You can also delete your account from inside the app, and Hearn will erase your projects.

Which devices does Hearn run on?

In any modern browser today. iOS and Android apps are coming soon, and a desktop app after that.

How do I cancel, and can I get a refund?

Cancel from the store you subscribed through, or from your account on the web. App Store and Google Play purchases follow Apple’s and Google’s refund processes; web purchases are handled by us. The refund and cancellation policy explains each.

Who makes Hearn?

Hearn is made by Crowbly LLC, a small independent company. Write to write@hearn.app and a person will answer.

Your next chapter is one click away.

Open Hearn, start in guest mode, and write. You can sign in later.

Start writing