Sesori vs Happy Coder
Happy Coder is an MIT-licensed open-source mobile client for Claude Code, Codex, and OpenClaw, with end-to-end encryption (TweetNaCl) and a self-hostable relay. Sesori targets the same job with a different agent lineup — OpenCode, Codex, and Cursor today, Claude Code coming soon — a native iOS and Android app, and a bridge designed to plug in more assistants over time.
If you live in Claude Code and want a free, MIT-licensed, community-maintained option you can self-host end to end, Happy Coder is excellent. If you use Cursor, or want one app across OpenCode, Codex, and Cursor without running a wrapper per session, Sesori is the better fit.
Reviewed July 20, 2026. Product, platform, and pricing details can change; verify them with Sesori’s quickstart and the official Happy Coder source.
Side by side
| Feature | Sesori | Happy Coder |
|---|---|---|
| Primary agents | OpenCode, Codex, and Cursor today. Claude Code coming soon. | Claude Code, Codex, and OpenClaw, plus any ACP-compatible agent. |
| License | Source-available bridge under the Functional Source License (FSL). | 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 | Free to use. Bridge is source-available under the Functional Source License (FSL). | Free. MIT open-source, with an option to self-host the relay. |
| Roadmap focus | Claude Code support next, polished native UX, account-based onboarding. | Community-driven, 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 use Cursor, which Happy Coder does not target as a first-class agent.
- You want one app across OpenCode, Codex, and Cursor without a wrapper per session.
- 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.
Pick Happy Coder if you
- You live in Claude Code today — Sesori does not support it yet.
- You want a free, MIT-licensed option you can read and audit end to end.
- You want to self-host the relay on your own infrastructure.
- You are happy with community-driven software and the GitHub-driven roadmap.