Happy

What is Happy?

Happy is an MIT-licensed harness for running coding agents. The desktop app for macOS, Windows and Linux brings Claude, Codex and Grok into one place, reuses the Claude Code, Codex and Grok sign-ins already on your machine, and needs no Happy account for model access. Each model keeps its native prompts and tools, and you can switch models without losing the transcript. Agents can hand work to subagents on any of the three models, message each other, run on schedules and keep going through a closed window or restart. Parallel work gets its own Git worktree on a separate branch, risky actions run inside an OS sandbox, and a phone app syncs the same sessions with end-to-end encryption. Teams can share one Happy Agent. The software is free; the only charge is voice in the phone app, with 20 free minutes per 30 days and a subscription for up to 5 hours, or no limit from Happy if you connect your own ElevenLabs agent. The original Happy CLI is now in maintenance mode.

Use cases

• Run Claude, Codex and Grok agents in one app
• Control coding sessions from your phone
• Delegate work to subagents on any model
• Run parallel tasks in separate Git worktrees
• Talk to a coding agent by voice
• Share agents and sessions across a team
• Schedule messages and persistent bots

Who it's for

• Developers
• Claude Code users
• Engineering teams
• Open source enthusiasts

Why use Happy

• Your existing model subscriptions are reused, so there is no separate Happy bill for model access.
• Sessions persist across restarts, so long agent runs are not lost when a window closes.
• The phone app lets you check or steer coding sessions away from your desk with encrypted sync.
• An open MIT codebase means you can read, fork or self-host the relay.
• Sandboxing and worktrees keep parallel agent work isolated from your main branch.

Happy features

• Desktop app for macOS, Windows and Linux
• Native tools for Claude, Codex and Grok
• Subagents on any supported model
• Durable sessions that survive restarts
• Auto mode with OS-level sandboxing
• Git worktree per parallel workspace
• End-to-end encrypted phone app
• Multiplayer agent for teams
• Skills and MCP via Markdown and TOML
• Chief of Staff setup bot
• Voice agent powered by ElevenLabs

Happy integrations

• Claude Code
• Codex
• Grok Build
• ElevenLabs
• OpenAI
• MCP
• Git

How to get started with Happy

1. Download the Happy desktop app for macOS, Windows or Linux and open it.
2. Happy launches its own agent runtime and reuses the Claude, Codex and Grok sign-ins already on the machine.
3. Start a session, choose a model, and let agents work, handing tasks to subagents where needed.
4. Pair the phone app to follow the same sessions, approve permission requests or use voice.
5. Optionally deploy a remote agent or create a team so others can share projects and sessions.

Happy limitations

• Voice is the only paid part, with 20 free minutes per 30 days
• Voice sends audio and some session content to ElevenLabs
• Model access requires your own Claude, Codex or Grok subscriptions
• The original Happy CLI is in maintenance mode and gets only critical fixes

Happy pricing

Happy is open source, so you can use and self-host it for free.

Happy plans

• Free

  Free

  • Desktop app with Claude, Codex and Grok
  • Phone app
  • 20 voice minutes per 30 days

• Voice subscription

  Price on vendor site

  • Up to 5 hours of voice per 30 days

Plans as listed on the official pricing page on 24 Oct 2026. Prices can change and may vary by country or exclude tax. Check the official pricing page.

Happy alternatives

The main Happy alternatives listed on Debuly are Claude Code, Conductor, Cursor, Zed, OpenCode and Cline. The table compares pricing and platforms; order is A–Z.

1. 

   Claude Code

   Anthropic's coding agent that fixes bugs, writes tests and runs migrations from your terminal, IDE, desktop app, web or Slack.

   CodingAutomation and agentsDeveloper platforms
   PaidVisit Claude Code (official site)
2. 

   Cline

   Open-source AI coding agent for VS Code, JetBrains, the terminal and desktop that edits files and runs commands with your approval.

   CodingDeveloper platformsAutomation and agents
   Open sourceVisit Cline (official site)
3. 

   Conductor

   Enterprise platform for AI search (AEO) and SEO: content creation, visibility reporting, site monitoring and agent tooling.

   Marketing and SEOWritingResearch and search
   Contact salesVisit Conductor (official site)
4. 

   Cursor

   AI code editor and coding agent with cloud agents, Bugbot code review and multi-provider models, sold with Grok and X plans.

   CodingAutomation and agentsDeveloper platforms
   FreemiumVisit Cursor (official site)
5. 

   OpenCode

   Open-source AI coding agent for terminal, desktop and IDE, with optional low-cost Go model subscriptions and a team Console

   CodingDeveloper platformsAutomation and agents
   FreemiumVisit OpenCode (official site)
6. 

   Zed

   Open-source, GPU-accelerated code editor written in Rust, with multiplayer editing and optional AI agents, edit predictions and hosted models.

   CodingDeveloper platforms
   Open sourceVisit Zed (official site)

Happy FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Image credits

• Logo: from happy.engineering · fetched 23 Oct 2026 · Vendor trademark, used only to identify the product; removed on request
• Cover: none collected yet, so a generated tile is shown.

Spot an error? Report an issue with this listing. We also remove a logo or image on the owner's request.