:3 Code

:3 Code is an "agent harness control surface". It enables control of the agents on your machine with a best-in-class mobile app (iOS, Android), web app and Electron-based desktop app.

Works with your subscriptions on Claude Code, Codex, Cursor, Grok Build, OpenCode, Google Antigravity, and Southbag Code. If they're set up on your computer, :3 Code can control them.

"Wait, what are you selling me?"

Nothing. We built :3 Code because we wanted the best possible development experience with agents. We were inspired by existing solutions like the Codex desktop app, Conductor, Claude Desktop and Cursor Glass, but none met our bar.

We wanted something performant, remote-ready, and truly open. If we ever go the wrong direction, we want you to have everything you need to fork and build the editor that you want.

Installation

Warning

:3 Code currently supports Codex, Claude, Cursor, Grok Build, OpenCode, Antigravity, and Southbag Code. Install and authenticate at least one provider before use:

• Codex: install Codex CLI and run codex login
• Claude: install Claude Code and run claude auth login
• Cursor: install Cursor CLI and run agent login
• Grok Build: install Grok Build CLI and run grok login
• OpenCode: install OpenCode and run opencode auth login
• Antigravity: enable it in Settings, then use Install Antigravity and Sign in with Google. No CLI is required.
• Southbag Code: install Southbag Code with npm i -g @southbag/code. When it is installed, it is the default provider for new threads.

Try it out (install-free)

The easiest way to test :3 Code is to run the server in your terminal (requires Node.js 22.16+, 23.11+, or 24.10+):

npx t3@latest

This will launch :3 Code's backend on your machine as well as the local web app to control your agents.

Tip: Use npx t3@latest --help for the full CLI reference.

Desktop app

Install the latest version of the desktop app from GitHub Releases, or from your favorite package registry:

Windows (winget)

winget install T3Tools.Colon3Code

macOS (Homebrew)

brew install --cask colon3-code

Arch Linux (AUR)

Stable:

yay -S colon3code-bin

Nightly:

yay -S colon3code-nightly-bin

The AUR packaging is maintained in this repository under packaging/aur.

Some notes

We are very very early in this project. Expect bugs.

We are (mostly) not accepting contributions yet. Small fixes may be considered. Big features will not be.

Documentation

Full docs live in docs/. There's no docs site yet.

• Install and first run
• Permission modes
• Keyboard shortcuts
• Project settings
• Remote access from a phone or another machine
• Keeping app and server in sync
• Source control integrations
• Multiple accounts: Codex · Claude
• Run :3 Code as a background service

Building from source? Start at docs/internals/overview.md.

If you REALLY want to contribute still.... read this first

Install vp

:3 Code uses Vite+ so you'll need to install the global vp command-line tool.

macOS / Linux

curl -fsSL https://vite.plus | bash

Windows

irm https://vite.plus/ps1 | iex

Checkout their getting started guide for more information: https://viteplus.dev/guide/

Install dependencies

vp i

Read CONTRIBUTING.md before reporting a bug or opening a PR.

Have a feature request? Start an Ideas discussion.

Need support? Join the Discord.