DevFob vs Happy
Happy (happy.engineering, a.k.a. Happy Coder) and DevFob solve the same problem: answer the Claude Code or Codex session running on your computer from your phone. They're two of the most privacy-serious options in this space, and they get there by different routes: Happy syncs end-to-end-encrypted messages through a relay server; DevFob uses no server at all. Obvious disclosure up front — DevFob is our product. Here's the comparison we'd want to read anyway.
| DevFob | Happy | |
|---|---|---|
| Price | $15 once (launch price; $29 from Aug 14), own it forever. Free updates. 14-day full trial, no card. Phone, watch, and Android apps are free companions. | Free. The one paid extra is their voice assistant (1 hour free, then a subscription, per their site as of July 2026). |
| Source model | Closed source; protocol and threat model documented publicly; license keys verified offline (the app never phones home). | Open source, MIT — the apps, the CLI, and the relay server (github.com/slopus/happy). |
| Architecture | No server anywhere. Phone ↔ Mac directly over your LAN or the Mac's own hotspot. Nothing — not even ciphertext — transits a third party. | Relay server. Messages are encrypted on your devices, then synced as ciphertext through their hosted relay (or one you self-host with Docker). |
| Encryption | End-to-end: Curve25519 pairing; every frame sealed with ChaCha20-Poly1305; keys never leave your devices. | End-to-end for session content: keys generated client-side; the relay stores and forwards encrypted blobs it can't read (per their docs). |
| Account | None. No sign-up anywhere. | No classic sign-up either — devices pair by QR code and authenticate with keys rather than passwords (per their docs). |
| Agents | Claude Code and Codex. | Claude Code and Codex, wrapped via their happy CLI. |
| Platforms | Native Mac menu-bar app (the product), plus free iPhone, Apple Watch, Android (closed beta), and Wear OS companions. | iOS, Android, and a web app, driven by a CLI wrapper on your computer. No watch app that we could find. |
| Answering prompts | Structured multi-choice answers, plan approval with the full plan text, and permission gates — same UI on phone, watch, and Mac. | Full chat-style session control from the phone or web, with push notifications when the agent needs you. |
| Rate limits | Live usage meters per account; auto-switches to a saved login with headroom before a run stalls. | Not a feature we could find. |
| Lid-closed use | Nomad mode: Mac stays awake and reachable in a bag, hops to your phone's hotspot when known Wi-Fi drops. | Depends on your machine staying awake and online by other means; the relay still needs it connected. |
| Works offsite | On your LAN, your hotspot, or a relay you self-host. By design there is no vendor cloud fallback. | Anywhere with internet through the relay — that's the design, and it works without network thought. |
Where Happy is genuinely the better pick: you want free — Happy costs nothing and that's a complete answer for a lot of people. You want open source you can audit, patch, and self-host end to end. You want to check on runs from any internet connection, or from a browser tab, with zero network setup. Or you want voice coding. Happy is a serious, well-built project, and if you never intend to spend money on this category, it's the one to install.
Where DevFob is the better pick: you don't want your sessions transiting anyone's server, even encrypted (a relay still sees connection metadata — when you work, from where, how much); you want a real Apple Watch or Wear OS app; you juggle multiple Claude accounts against rate limits and want auto-switching; you keep the Mac working lid-closed in a bag; or you want a native Mac menu-bar app with a glanceable notch rather than a CLI wrapper, with one company accountable for the whole thing.
The architectural difference, concretely
Both tools encrypt end-to-end, and we want to be fair: Happy's model is honest and its server is open source, so you can verify it only forwards ciphertext — or run your own copy. What a relay still learns is metadata: that your devices connected, when, from which addresses, and how much traffic flowed. DevFob removes the middle entirely — your phone talks to your Mac over your own network, so there is no third party to learn even that. The trade is symmetric: Happy's relay gives you free access from anywhere on the internet; DevFob asks you to bring the network (LAN, hotspot, or a relay you host yourself).
One caveat worth knowing if you evaluate Happy: its end-to-end claims cover session content. A public code review in February 2026 (GitHub discussion #680) flagged that API keys stored through their cloud "connect" feature were encrypted with a server-side secret rather than client keys. Their team may well have addressed it since — check the thread before you rely on that specific feature.
The money difference, concretely
Happy is free and open source; DevFob is $15 once. If free is the requirement, stop reading and use Happy — genuinely. The $15 buys a different product, not a nicer skin on the same one: a native Mac menu-bar app and notch readout, watch apps on both platforms, per-account rate-limit meters with auto-switch, Nomad lid-closed mode, and a no-server architecture. If you try it and it isn't for you, the trial is 14 days and refunds are 30 — you can make this decision without risking anything.
Happy details from happy.engineering, their docs, and the public slopus/happy repository (which now also contains the relay server — their separate happy-server repo was archived and merged into it in early 2026) as of July 2026 — pricing and features may change; check their site. Spotted something outdated or unfair here? Tell us and we'll fix it.