One app for every
coding agent.

Set up is almost too easy.

No login required. Download and we auto-pull in all your agents.

1. 

   

   1Download Openszn

   Open it on your Mac. Claude Code, Codex and the other agents you already use connect on their own.

2. 

   acme-web3 chatsacme-api2 chatsdocs-site1 chat

   2Pick up where you left off

   Openszn finds the folders your agents have worked in. Choose the ones you want and your newest chats come along.

3. 

   The cart test fails one run in ten.@Codexfix it and add a test

   3Send your first message

   Say what you need, and the agent gets to work. Type @ to hand the next message to another agent.

Built for running more than one agent at a time.

@ any agent

Switch agents mid-chat

Type @Codex or @Claude Code to send the next message to another agent. The chat keeps its history and carries on.

Worktrees

Run agents in parallel

Each chat can work in its own git worktree, so several agents can change one repo at once. Merge a branch when it is ready.

Plugins

Any UI in the side panel

Add panels, themes and commands with a typed SDK. Plugin UI runs in a sandbox, and nothing installs until you review it.

Browser and schedules

A browser and a scheduler built in

Agents open pages in the built-in browser while you watch. Scheduled tasks run a prompt every morning, or every hour, on their own.

Your subscription, your machine.

Local first

Openszn runs on your Mac. Chats, files and settings stay on your computer.

No sign-up

There is no Openszn account. Sign in to each agent with the plan you already pay for.

Open source, Apache 2.0

Read the code, change it, ship your own build. The license lets you.