V2.4

Sessions you can resume →

Hand it a task.

Read the diff.

Ship

it.

Hearth is a coding agent that lives in your terminal. It reads your code, makes the change, runs your tests and opens the pull request. You read every line before it merges.

curl -fsSL get.hearth.example | sh

COPY

INSTALL HEARTH

[I]

SEE HOW IT WORKS

USED BY 4,200 TEAMS

Northlight

parcelworks

Ledgerly

TIDEMARK

Fernbank

quarry/io

Olvane

Brightwell

Northlight

parcelworks

Ledgerly

TIDEMARK

Fernbank

quarry/io

Olvane

Brightwell

[ 01 · WHY HEARTH ]

Terminal speed, without the terminal guesswork.

Built for people who read every diff,

not for people who skip them.

every edit lands as a diff first

MEDIAN TASK TO PR

11 min

MEDIAN TASK TO PR

11 min

MEDIAN TASK TO PR

11 min

NEED NO EDITS

1 in 3

TEAMS EACH WEEK

4,200

USED FOR TRAINING

None

[ 02 · WHAT IT DOES ]

Reads the repo

Plans in two lines

Edits file by file

Runs your tests

Opens the pull request

One prompt in the terminal. Five steps you can watch, stop or undo.

READ THE PRODUCT TOUR

~/shop-api · read

[ FIG. 1 ]

❯ fix the failing checkout test

● building a map of the repository

● 3,418 files, 212 folders

◆ Read src/cart/total.ts

◆ Read tests/checkout.test.ts

✓ opened 2 of 3,418 files

~/shop-api · read

[ FIG. 1 ]

❯ fix the failing checkout test

● building a map of the repository

● 3,418 files, 212 folders

◆ Read src/cart/total.ts

◆ Read tests/checkout.test.ts

✓ opened 2 of 3,418 files

~/shop-api · read

[ FIG. 1 ]

❯ fix the failing checkout test

● building a map of the repository

● 3,418 files, 212 folders

◆ Read src/cart/total.ts

◆ Read tests/checkout.test.ts

✓ opened 2 of 3,418 files

01 READ

It reads like a person.

Outline first, then only the files that matter. Every file it opens is listed on screen.

~/shop-api · plan

[ FIG. 2 ]

plan.md

1. Move rounding to after tax

2. Update the two affected tests

3. Run the checkout suite

⏎ run step 1 e edit the plan

~/shop-api · plan

[ FIG. 2 ]

plan.md

1. Move rounding to after tax

2. Update the two affected tests

3. Run the checkout suite

⏎ run step 1 e edit the plan

~/shop-api · plan

[ FIG. 2 ]

plan.md

1. Move rounding to after tax

2. Update the two affected tests

3. Run the checkout suite

⏎ run step 1 e edit the plan

02 PLAN

It says what it will do first.

A short plan in a plain Markdown file. Reorder it, cut a step or add a note before anything changes.

~/shop-api · edit

[ FIG. 3 ]

src/cart/total.ts +2 −1

− lines.map(i => Math.round(i.price * i.qty))

+ lines.map(i => i.price * i.qty)

+ return Math.round(sum(lines) * (1 + tax))

esc undo a accept r reject

~/shop-api · edit

[ FIG. 3 ]

src/cart/total.ts +2 −1

− lines.map(i => Math.round(i.price * i.qty))

+ lines.map(i => i.price * i.qty)

+ return Math.round(sum(lines) * (1 + tax))

esc undo a accept r reject

~/shop-api · edit

[ FIG. 3 ]

src/cart/total.ts +2 −1

− lines.map(i => Math.round(i.price * i.qty))

+ lines.map(i => i.price * i.qty)

+ return Math.round(sum(lines) * (1 + tax))

esc undo a accept r reject

03 EDIT

Every edit is a diff.

Nothing is rewritten behind your back. Press esc and the last change is gone.

~/shop-api · check

[ FIG. 4 ]

◆ Run make test

FAIL checkout rounds once

● tax is read from settings, adjusting

◆ Run make test

✓ 42 passed in 3.1s

~/shop-api · check

[ FIG. 4 ]

◆ Run make test

FAIL checkout rounds once

● tax is read from settings, adjusting

◆ Run make test

✓ 42 passed in 3.1s

~/shop-api · check

[ FIG. 4 ]

◆ Run make test

FAIL checkout rounds once

● tax is read from settings, adjusting

◆ Run make test

✓ 42 passed in 3.1s

04 CHECK

It runs your tests, then tries again.

Your own test command, from your rules file. A red result sends it back to the plan.

~/shop-api · ship

[ FIG. 5 ]

/ship

● checks: lint, types, tests

✓ all green

✓ branch fix/cart-rounding

✓ opened pull request #318

~/shop-api · ship

[ FIG. 5 ]

/ship

● checks: lint, types, tests

✓ all green

✓ branch fix/cart-rounding

✓ opened pull request #318

~/shop-api · ship

[ FIG. 5 ]

/ship

● checks: lint, types, tests

✓ all green

✓ branch fix/cart-rounding

✓ opened pull request #318

05 SHIP

It opens the pull request.

With a description you would be glad to review. It replies to comments with fixes.

[ 03 · SLASH COMMANDS ]

Commands

(6)

Type a slash and pick one, or describe the job in plain words. Each one shows its work as it goes.

BUILT IN

YOUR OWN

UNLIMITED

MEDIAN RUN

11 MIN

UNDO

ESC

KEY

COMMAND

WHAT IT DOES

TYPE

[F]

/fix

Point it at a failing test or an error. It finds the cause and proposes the smallest change.

EDITS CODE

[R]

/review

Reads a branch like a careful teammate and comments on the lines that worry it.

COMMENTS

[T]

/test

Writes the tests your change is missing and keeps the ones that catch real bugs.

WRITES TESTS

[E]

/explain

Answers how part of the codebase works, with the files and lines as sources.

ANSWERS

[P]

/plan

For bigger jobs: a written plan you edit first, then it works through it step by step.

PLANS

[S]

/ship

Runs your checks, writes the commit and opens the pull request with a clear description.

SHIPS

or write your own in a Markdown file

[ 05 · CONNECTIONS ]

Plugs into the tools you already run.

One command per connection, each asking for the smallest permission that works.

$ hearth connect source

Source hosting

SOURCE

→

$ hearth connect source

Source hosting

SOURCE

→

$ hearth connect tracker

Issue tracker

PLANNING

→

$ hearth connect tracker

Issue tracker

PLANNING

→

$ hearth connect chat

Team chat

MESSAGING

→

$ hearth connect chat

Team chat

MESSAGING

→

$ hearth run --ci

Continuous integration

BUILD

→

$ hearth connect editor

Code editor

EDITOR

→

$ hearth connect editor

Code editor

EDITOR

→

$ hearth connect errors

Error monitoring

MONITORING

→

$ hearth connect errors

Error monitoring

MONITORING

→

$ hearth upgrade --explain

Package registry

PACKAGES

→

$ hearth upgrade --explain

Package registry

PACKAGES

→

ALL TEN CONNECTIONS

three more on the page

[ 06 · CUSTOMERS ]

What teams say after a month of reading diffs.

Names and companies in this template are fictional.

PARCELWORKS · 40 ENGINEERS

−38%

review time per pull request, because the description arrives with the change

“I hand it the dull tickets in the morning and read the diffs after lunch.”

PRIYA NAIR · NORTHLIGHT

STORY

How a four-person team wrote 212 tests in a month without writing one by hand.

Read the story →

ACROSS 4,200 TEAMS

11m

median from task to a reviewed pull request

“The permission prompt sold our security lead. It says exactly what will run, where, and why.”

RAVI MENON · CTO, QUARRY

You stay in the loop, not in the way.

review · total.ts

[ FIG. 6 ]

12 export function cartTotal(items, tax) {

13 − const lines = items.map(i => Math.round(i.price * i.qty))

13 + const lines = items.map(i => i.price * i.qty)

14 + return Math.round(sum(lines) * (1 + tax))

15 }

● rounding now happens once, after tax

REVIEW

Comments land on the line they are about.

Hearth explains each edit where it made it. Reply in the margin, accept, reject or ask for another go.

permission

[ FIG. 7 ]

Hearth wants to run a command

$ make test

in ~/shop-api

why: to check the change it just made

y allow once a always here n no

PERMISSIONS

It asks before it runs anything new.

The prompt names the exact command, where it runs and why. Your answer can be saved for the whole team.

press esc and it is gone

READ ABOUT PERMISSIONS

SECURITY

[ 08 · SECURITY ]

Safe to hand

real work to.

SECURITY DETAILS

ASK A QUESTION

Your code stays yours

Only the files a task needs are sent to the model. Nothing is used for training.

Rules live in a file

hearth.toml lists what is allowed and what never is. Commit it and your team shares it.

Secrets are left out

Keys and tokens are recognised and removed before anything leaves your machine.

Your region, your data

Prompts are kept 30 days in the region you choose, then deleted.

[ 09 · PRICING ]

Start free. Pay when it earns its place.

Change plans or cancel any time. No seat minimums, no sales call.

Free

for personal projects

No card needed

Try Hearth on side projects and small repositories.

50 tasks each month

Balanced model level

All slash commands

Community support

CHOOSE PLAN

Pro

$20

per month

or $16 a month billed yearly

For people who use an agent every working day.

Unlimited tasks, fair use

Quick, balanced and deep levels

Resumable sessions

Email support in one day

CHOOSE PLAN

Team

$40

per person, per month

or $32 a month billed yearly

For teams that share rules, approvals and a bill.

Everything in Pro

Shared RULES.md and approvals

Usage reports by project

Priority support

CHOOSE PLAN

COMPARE EVERY PLAN

most teams start on Pro

[ 10 · CHANGELOG ]

Every release, written down.

Including the small fixes, each linked to its commit.

RELEASES THIS YEAR

MEDIAN FIX TIME

2 DAYS

CURRENT

V2.4.0

Sep 22, 2026

2.4.0

Sessions you can resume

New

Sep 8, 2026

2.3.2

Faster reads on large repositories

Improved

Aug 25, 2026

2.3.0

Ask before running anything new

New

Aug 4, 2026

2.2.0

Review comments on the exact line

New

Jul 21, 2026

2.1.1

Fixed: edits landing in the wrong file

Fixed

FULL CHANGELOG

[ 11 · NOTES ]

Notes from the people building Hearth.

ALL NOTES

Sep 18, 2026

Safety

What a coding agent should never do without asking

Sep 2, 2026

Engineering

How we measure a good pull request

Aug 20, 2026

Guides

Five tasks to hand to an agent this week

[ 12 · HELP ]

Stuck? Ask it the way you would ask a colleague.

Docs

Short pages with a command to try at the end of each.

EXAMPLE: HOW DO I LIMIT WHICH FILES IT CAN TOUCH?

OPEN THE DOCS

Changelog

Every release in plain words, newest first.

EXAMPLE: WHAT CHANGED IN 2.4?

READ THE CHANGELOG

People

A person answers within one working day.

EXAMPLE: CAN WE TRY IT ON A TEAM OF TWENTY?

WRITE TO US

[ 13 · QUESTIONS ]

Asked before installing.

ASK SOMETHING ELSE

What is Hearth?

Which languages does it work with?

Do I have to use a particular editor?

What happens if it gets something wrong?

Is there a free plan?

Can I change plans or cancel?

[ 14 · START ]

Start a session in your terminal.

curl -fsSL get.hearth.example | sh

COPY

INSTALL HEARTH

[I]

SEE PRICING