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


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.
, 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
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


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.




Switch a Japanese or Traditional Chinese page to vertical (縦書き) and back. Ruby for furigana, counts in characters.
Arabic pages, menus and punctuation behave the way a native reader expects.
Translate a chapter into another language and keep the two versions linked, side by side.
Interface languages
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.
Owners, editors and reviewers each get what they need. Changes merge as they type.
Reviewers leave notes and suggested wording in the margin. You accept or decline each one.
Share a chapter or a whole project with a link that you can switch off at any time.
Export a finished manuscript as EPUB, print-ready PDF (vertical too), Word or Markdown. Or publish straight from Hearn to Ghost or WordPress.
Formats
Publish to


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.
Your manuscript and your Codex, together, so it knows who was where, and when.
It points; you decide. Drafting happens only when you request it.
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 policyOne project, on every device you own. Hearn works offline and catches up when you are back online.
Web
Open now
web.hearn.appiOS
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.
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.
$0
For finding your voice.
$69.99/ year
Save about 27%
For a whole library of work.
$109.99/ year
Save about 29%
With an editor that reads everything.
$119.99/ year per seat
For teams and small presses.
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
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.
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.
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.
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.
In any modern browser today. iOS and Android apps are coming soon, and a desktop app after that.
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.
Hearn is made by Crowbly LLC, a small independent company. Write to write@hearn.app and a person will answer.
Open Hearn, start in guest mode, and write. You can sign in later.
Start writing