Comparison
Sesori vs Happy Coder
Happy Coder is an MIT-licensed open-source mobile client for Claude Code, Codex, and Gemini CLI with end-to-end encryption (TweetNaCl) and an optional self-hosted relay. Sesori targets the same job, but with a different starting agent (OpenCode), a native iOS and Android app, and a bridge that is designed to plug into more assistants over time.
TL;DR
If you live in Claude Code or Codex and want a free, MIT-licensed, community-maintained option, Happy Coder is great. If you use OpenCode or want a polished native mobile app with a bridge built for multi-agent support, Sesori is the better fit.
Side by side
| Feature | Sesori | Happy Coder |
|---|---|---|
| Primary agents | OpenCode today. Claude Code, Codex, and others planned via the bridge plugin model. | Claude Code, Codex, and Gemini CLI. |
| License | Open-source bridge. | MIT-licensed across the stack. |
| Mobile app | Native iOS and Android. | iOS, Android, and a web client. |
| How it attaches to the agent | Lightweight bridge CLI runs alongside your local agent and pairs to your account. | CLI wrapper. Run `happy` instead of `claude` to mirror the session. |
| Relay model | End-to-end encrypted relay (X25519 + XChaCha20-Poly1305). Only opaque encrypted traffic reaches it. | Signal-grade end-to-end encryption (TweetNaCl), zero-knowledge relay. Self-hostable if desired. |
| Voice input | Native voice for prompts and replies, designed for coding sessions. | Built-in voice agent using Eleven Labs for speech-to-text. |
| Pricing | Bridge is open-source today. Long-term pricing announced as the product matures. | Free. MIT open-source, with an option to self-host the relay. |
| Roadmap focus | Multi-agent plugin architecture, polished native UX, account-based onboarding. | Community-driven, currently free with no paid tiers. Strong Claude Code coverage and an active GitHub repo. |
Which one is right for you?
Pick Sesori if you
- You already use OpenCode, or expect to switch between multiple AI coding tools.
- You want a native mobile app rather than a wrapper around a web view.
- You prefer account-based pairing instead of running a CLI wrapper for each session.
- You want a bridge built to host more agent integrations over time.
Pick Happy Coder if you
- You live in Claude Code, Codex, or Gemini CLI today and want a free, MIT-licensed option.
- You enjoy running a CLI wrapper and want full control over the relay.
- You want to self-host the entire stack on your own infrastructure.
- You are happy with community-driven software and the GitHub-driven roadmap.
FAQs
Happy Coder is a wrapper-CLI plus client around Claude Code and Codex. Sesori is a separate bridge process plus native app, currently focused on OpenCode, with multi-agent support on the roadmap. Both are end-to-end encrypted. The choice usually comes down to which agent you live in and how polished a native mobile UX you want.
Yes. Both projects encrypt session traffic so the relay can't read it. Happy Coder is also fully self-hostable. Sesori's relay is operated by the Sesori team but only sees opaque binary by design.
Not yet. OpenCode is the first supported agent. The bridge is being built with a plugin model so Claude Code and Codex can be added later. If you're a Claude Code user today and don't want to wait, Happy Coder is a reasonable choice.
The bridge is open-source and runs on your machine. The relay is currently operated by Sesori. If self-hosting the relay is a hard requirement for you today, Happy Coder is the safer pick.
Both support voice. Sesori treats voice as a first-class input designed for coding sessions, with prompts and replies tuned for that workflow. Happy Coder has a built-in voice agent using Eleven Labs for speech-to-text.