Happy
Happy is an agent app that runs Claude, Codex, and Grok in one app for people who code with several AI models.
What it is good for
- Running several AI coding models side by side in one app
- Continuing a coding session from your phone
- Inviting a colleague to watch and steer an AI coding session
- Using existing AI subscriptions without paying for another tool
At a glance
- Who it is for
- Setup
- Install a desktop app or browser extension
Level 3 of 5. Download and install it like any other app or extension.
- Cost
- Free and open source
- Type
- Agent app
- Tasks
- Works with
- Claude Code, Codex, Grok, Gemini, Antigravity, OpenCode
Momentum
- Rank this week
- Not ranked yet
- Best rank
- None yet
- GitHub stars
- 24,447
GitHub numbers as of Nov 2, 2026. Updated weekly.
Official links
Setup steps are on the official pages. We do not repeat them here, since they change.
Questions
- Is Happy free?
- Yes. It is free and open source (MIT license).
- Do I need to know how to code to use Happy?
- No. Download and install it like any other app or extension.
- What does Happy work with?
- According to its own documentation, it works with Claude Code, Codex, Grok, Gemini, Antigravity, and OpenCode.
- What is Happy good for?
- Running several AI coding models side by side in one app, continuing a coding session from your phone, inviting a colleague to watch and steer an AI coding session, and using existing AI subscriptions without paying for another tool.
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