Coding agents that work in your own Cloudflare account.

Give an agent a task and a repository. It works in a locked sandbox, saves its progress as it goes, and comes back with a pull request for you to review.

Open source, MITNo Quarn serversYour keys never reach the sandbox

From a task to a pull request

You describe the work. The agent does it on its own and checks in with you when it matters.

It asks before anything newBefore an agent reaches a website or service it hasn't used, it waits for your yes, in the app or on Telegram.
Every step is savedProgress is saved as commits, so you can see what changed and go back to any point.
You always mergeThe agent opens a pull request under your own GitHub bot. It can't merge anything.

Fix the flaky upload testWorkingacme/api, started from your phone

Reading the code to find the failing test
Found it: uploads finish before the file is fully written
Writing a fix and a test that catches it
!Wants to open docs.stripe.com to check how uploads are confirmed
or answer on Telegram
Running the tests: all passing
Pull request ready. Review it

Use the AI plan you already pay for

Connect one or several. Quarn never resells usage, it calls your provider with your own account.

Claude

Add a Claude Console key. Max and Ultra plans include monthly API credits.

ChatGPT

OpenCode Go

Use your OpenCode Go subscription.

OpenRouter

Pick any model on OpenRouter with your own key.

Your keys stay in your Cloudflare account. The sandbox where the agent works never sees them.

Your account, not ours

Quarn is open source under MIT. You install it on your own Cloudflare account, so your code, your keys and every session's history stay with you.

1A Cloudflare account on Workers Paid, $5 a month plus what your agents use
2A domain on Cloudflare for your Quarn app
3A GitHub account, where setup creates your own bot

More tools on the way

Agents comes first. The others run on the same account when they're ready.

Quarn Agents

At launch

Agents that take a task, work in a sandbox, check in with you and hand back a pull request.

Quarn Review

Later

A second opinion on every pull request. Several reviewers look for problems, and a checker throws out the ones it can't confirm.

Quarn Notebook

Later

Shared memory for your agents, so a fix found once is there the next time.

Be the first to try Quarn

We'll email you once to confirm, and once when it's ready.