# Happy > Source: > Published: 2026-10-25 15:00:00+00:00 24,302stars+83(+0.3%) Last 30 days - Last commit 10 hours ago - Repository age 1 year - Version 1.2.5 - License [MIT](https://openalternative.co/licenses/mit) - Self-hosted [Yes](https://openalternative.co/collections/self-hosted) - Repository [slopus/happy](https://github.com/slopus/happy) Happy is a harness for AI coding agents. Instead of juggling separate interfaces for Claude, Codex, and Grok, you get one app that connects to all three using the subscriptions you already have. No new API costs, no separate billing layer. The core idea is straightforward: pick the model that fits the task, run it, and let Happy manage the session. You can delegate work to subagents across different providers from the same interface, which matters when one model handles a task better than another. Key capabilities: - **Multi-provider orchestration** connects Claude, Codex, and Grok in one place, each using its vendor's native prompts and tooling - **Subscription reuse** means you sign in with your existing Claude, Codex, and Grok accounts rather than paying for another service on top - **End-to-end encrypted mobile app** lets you resume or start sessions from your phone when you're away from your desk, with encrypted sync between devices - **Team server** support makes it natively multiplayer: deploy a shared server, and everyone authenticates as themselves while sharing projects and sessions - **Terminal compatibility** keeps the CLI-first workflow intact; start Claude Code or Codex in your terminal and pick up that session anywhere Projects stay as ordinary folders on your own hardware. The code is MIT-licensed, so you can read it, fork it, or ship a custom build. For teams that want a [conductor-style](https://openalternative.co/alternatives/conductor) layer over multiple AI agents without locking into a managed platform, Happy handles that without adding another subscription to the pile. Every Sunday we deconstruct one proprietary app and pick the best open source alternatives worth switching to. - Stars - Last commit - License AI Run multiple AI coding agents in parallel, side by side - Stars Stars growing quickly over the last 30 days105,166 - Last commit 9 hours ago - License MIT Agent Development Environment that runs Claude Code, Codex, Gemini, and other CLI agents in parallel across isolated git worktrees, with terminals, browser, diff review, and git tools built in. Compare with AI-powered coding made simple and efficient - Stars 29,901 Run coding agents from your phone, desktop, or terminal - Stars 21,913 Run dozens of AI coding agents in parallel on your machine - Stars 15,530 Dashboard for running multiple coding agents in parallel - Stars 6,075 Code with Claude, Codex, Gemini, and more in one workspace - Stars 2,137 Parallel AI agent workspaces with Git and project context - Stars 1,360 Run Claude Code, Codex, Grok, and more from one app Stars growing quickly over the last 30 days Last commit 9 hours ago License MIT Advanced AI coding assistant that enhances development workflow with intelligent code suggestions, automated debugging, and seamless integration. Self-hosted orchestrator for coding agents like Claude Code, Codex, and Cursor, controlled from phone, desktop, web, or CLI. Stars growing over the last 30 days macOS app that orchestrates multiple AI coding agents simultaneously, each in its own isolated Git worktree, so you can work on many tasks at once. Desktop app that runs 25+ coding agents simultaneously, each isolated in its own Git worktree, so you can orchestrate code changes without switching tools. Desktop coding workspace that connects to AI subscriptions you already have, with parallel agents, worktrees, one-click PRs, and multi-project management. Run multiple AI coding agents in isolated Git worktrees, with cross-repo context, GitHub/Linear integrations, and support for Claude, Codex, Cursor, and more. - Stars Stars growing quickly over the last 30 days118 - Last commit 2 days ago - License Apache-2.0 A Mac app that brings multiple AI coding agents into a single window, running on your existing subscriptions with parallel agent sessions, PR management, and a built-in browser.