Both let you supervise coding agents from your phone. The difference is what happens when chat isn’t enough.
You want a mature, free, MIT-licensed mobile and web client for Claude Code and Codex, with approvals, push, voice, device switching, encrypted sync, and inline review. Happy's openness is a real advantage.
You want the alert to open the exact interruption with that agent's own files and diff, need Gemini in the same queue, or want to use a real terminal, file browser, repo-wide git view, localhost app, or desktop yourself.
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| Feature | DevReins | Happy Coder |
|---|---|---|
| Agent chat & approvals | ✓ | ✓ |
| Push when an agent needs you | ~web push today; native apps planned | ✓native iOS + Android |
| Agents supported | ✓native Claude, Codex, Gemini; others via live panes | ~Claude + Codex advertised |
| Independent operator terminal | ✓ | ~not advertised as a general-purpose shell |
| Files & Git review | ✓browse, search, status, log, diff, revert | ~inline diff; changed-file browser described as experimental |
| Open URL/port | ✓localhost in a phone frame | ~not advertised as a standalone surface |
| Self-hosted | ✓server runs on your box | ✓open source (MIT) |
| Encrypted session payloads | ✓relay is not issued session keys | ✓ |
| Price | ✓Free (early access) | ✓Free (open source) |
Sourced from Happy's official product repository and DevReins product behavior as of July 2026. Details change; check the source for the latest. See the full multi-tool comparison for Termius, Tailscale, and more.
Happy is genuinely good at what it does: a free, MIT-licensed mobile and web client for Claude Code and Codex with approvals, push, voice, encrypted sync, device switching, and inline diff review. If that workflow covers your needs, Happy is a compelling choice.
DevReins focuses on the whole fix. It routes you to the exact request, shows the files and diff for the agent that needs you, lets you reply or take over directly, and tells you whether your tap actually reached the session.
You also get controls of your own: a real terminal, files and search, repo-wide git status, log, diff, and revert, a localhost preview, and desktop access. Happy's agents can work with code too. The difference is that DevReins lets you look and act yourself, without asking an agent to do it for you. It also tracks Gemini CLI natively alongside Claude Code and Codex.
Happy has the stronger open-source story today. DevReins has a downloadable build, while a source-available release remains a later decision. Choose based on which of those matters more to you.
Yes. Happy is MIT-licensed and free to use. DevReins is also free during early access; a paid hosted-convenience tier is planned but not live.
Happy's current product centers on Claude Code and Codex sessions, approvals, voice, and inline review. DevReins puts controls you operate yourself next to every agent: a real terminal, a file browser with search, repo-wide git, a localhost preview, and the desktop.
Happy's current official repository advertises Claude Code and Codex. DevReins natively tracks Claude Code, Codex, and Gemini CLI, with other terminal agents available through live session panes.
Both encrypt session traffic. Happy is MIT-licensed and publishes its client and server code. DevReins runs machine actions locally and seals session payloads before its relay forwards them, but its source-available release is still only planned.
Free during early access. Install, log in, and pick your machine. It runs on your own computer, and the relay forwards only encrypted traffic.
Get DevReins Full comparisonMore matchups: DevReins vs OpenAI Codex Remote · DevReins vs Omnara · DevReins vs Claude Code Remote Control