Any Model. Your Subscription. Happy Harness.
Orchestrate Claude, Codex, Grok, Gemini and more in one app
Free and open source
- Multi-provider
Any model: Claude, Codex, Grok, Gemini, and more in one app. Give every task the model that fits, and delegate to subagents on any of them.
- Reuse your subscriptions
Sign in with the Claude, Codex, and Grok subscriptions you already pay for, and Gemini with your Google sign-in through Antigravity. Happy adds a harness, not another bill.
- Open source MIT
It runs on your own hardware and your projects stay ordinary folders. Read the code, fork it, ship your own build.
- 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.
- Natively multiplayer
Deploy a team server and work together. Everyone signs in as themselves and shares the same projects and sessions.
Love your terminal?
Keep it.
The OG Happy experience (if you know you know)
Start Claude Code or Codex in your terminal. Resume that session or start a new one from your phone. No Desktop app required.
# Not using Happy Desktop?
# Install the CLI here:
$ npm install -g happy
# Start Claude Code
$ happy claude
# Or start Codex
$ happy codexDownload Happy.
Free and open source