Happy Desktop

Any Model. Your Subscription.Happy Harness.

Orchestrate Claude, Codex, Grok, Gemini, and more in one app

Free and open source

https://github.com/user-attachments/assets/b3580704-f9e0-441e-80be-3f83f6a08ab5

   

What you get

1. Any model: Claude, Codex, Grok, Gemini, and more. Gemini runs through
   Antigravity, and OpenCode or any Agent Client Protocol agent plugs in as a
   harness. Give every task the model that fits, and delegate to subagents on
   any of them.
2. Reuse your subscriptions. Sign in with the Claude, Codex, and Grok
   subscriptions you already pay for; Antigravity, OpenCode, and ACP agents
   keep their own logins. Happy adds a harness, not another bill.
3. Open source MIT. It runs on your own hardware and your projects stay
   ordinary folders. Read the code, fork it, ship your own build.
4. End-to-end encrypted mobile app. Left your desk? The same sessions are
   already on your phone, and what moves between your devices is encrypted.
5. Natively multiplayer. Invite a colleague or a friend into the session.
   You both watch the same agent work, and either of you can steer it.

Resources

Website · Documentation · Discord · Development guide · MIT License

How Happy fits together

Original Happy CLI

The original CLI wraps the Claude Code and Codex harnesses directly in your
terminal and lets you continue from your phone.

For multi-model sessions and teams, move to the desktop app and Happy Harness.