Happier: steer your coding agents from your phone

Coding agents often work on their own for minutes at a time – and then stall on a question or an approval. If you're away from your desk, that's lost time. Happier solves exactly this: the agents keep running on your own machine, but you can watch and steer the session on the go.

What Happier is

Happier is a free, open-source application (MIT license) with a CLI, mobile apps for iOS and Android, desktop and web apps, and a relay server. By their own account, its developers contributed to the predecessor project Happy and started Happier as a separate project on that foundation. The first versions shipped in February 2026.

There are no extra costs – you use the subscriptions or API keys you already have, for Claude or ChatGPT for example.

Key features

• Sessions across devices. Start on your laptop, continue on your phone, without losing context.
• Many agents. According to the website, these include Claude Code, Codex, OpenCode, Cursor, Gemini, Copilot and Qwen. You can even switch agents within a session.
• End-to-end encryption. According to the project, the server only sees encrypted data and routing information, not your conversations.
• Self-hosting. You can run the relay server yourself. Alternatively, there is the hosted Happier Cloud service.
• Mobile git workflow. Review diffs, use worktrees, handle pull requests.
• Parallel and shared. Multiple sessions across multiple machines, shared sessions within a team, voice control.

Typical uses

• Watching long agent runs on the go and answering questions
• Reviewing diffs and PRs on your phone between meetings
• Small teams looking at one agent session together
• Companies running their own relay for privacy reasons

What to watch out for

• A very young project. Development builds ship almost daily, and the project itself warns they can break at any time. Stick to stable releases.
• Third-party dependency. Happier drives the CLIs from Anthropic, OpenAI and others. If those vendors change their tools or terms, features may be affected.
• Account switching. Happier offers automatic switching between several agent accounts. Check whether that is compatible with your provider's terms.
• Encryption only when enabled. When self-hosting, you can choose to store data unencrypted – which removes the most important protection.

Bottom line

For anyone who works with coding agents regularly, Happier is a pragmatic addition: the agent stays on your machine; only the controls go mobile.