Pier vs OpenChamber
OpenChamber is a macOS desktop app for OpenCode. Also available as a PWA. Open source under MIT.
Pier is an app for orchestrating coding agents, with native clients on desktop, mobile, web, and the CLI. Source-available commercial license.
Why pick Pier
OpenChamber runs on macOS, around OpenCode, with a phone PWA. Pier runs OpenCode too, on macOS, and adds:
- Linux and Windows desktop
- A native iOS and Android app
- Many more agents than OpenCode (Claude Code, Codex, Pi, plus 30+ more via the in-app ACP catalog)
- A scriptable CLI to drive agents and connect to remote daemons
Mobile
Pier ships a native iOS and Android app with the same feature set as the desktop. Install from the App Store or Google Play.
OpenChamber does not have a native mobile app.
Desktop
Pier ships on macOS, Linux, and Windows.
OpenChamber ships on macOS.
Providers
Pier runs Claude Code, Codex, OpenCode, and Pi natively, plus 30+ more agents through the in-app catalog including GitHub Copilot, Cursor, Gemini CLI, and Amp. Pier speaks the Agent Client Protocol, so any ACP agent works. Custom providers run any CLI agent. See Supported providers.
OpenChamber is built around OpenCode.
Panes
Pier's app has split panes and tabs (⌘D for vertical, ⌘⇧D for horizontal). Panes include a terminal alongside your agents, a diff viewer, and a browser for testing running services.
GitHub
Pier's app handles commit, push, opening PRs, watching checks and reviews, and merging.
CLI
Pier has a CLI that mirrors the app:
pier run --provider codex "implement OAuth"
pier run --host devbox:6767 "run the test suite"
pier ls
pier send <agent-id> "add tests"
pier schedule create --cron "0 9 * * 1" "audit the codebase"
pier run --host connects to a remote daemon. pier schedule runs an agent on a cron. pier loop retries an agent until a verification command passes.
OpenChamber does not have a CLI.
Worktrees and services
Pier runs each agent in its own git worktree. Each worktree gets its own dev server hostname like web--fix-auth--my-app.localhost, so parallel agents don't fight for ports.
Voice
Pier's speech-to-text and text-to-speech run locally on your device. OpenChamber does not have voice.
Comparison
| Pier | OpenChamber | |
|---|---|---|
| License | Source-available commercial license | Open source (MIT) |
| Desktop platforms | macOS, Linux, Windows | macOS |
| Mobile | Native iOS, Android | PWA |
| Providers | Claude Code, Codex, OpenCode, Pi + 30+ via ACP catalog + custom | OpenCode |
| Split panes and tabs | Yes | — |
| In-app terminal | Yes | — |
| In-app browser | Yes | — |
| GitHub workflow in app | Commit, push, PR, checks, reviews, merge | Yes |
| CLI | Run, --host, ls, send, schedule, loop | — |
| Git worktrees | Yes | Yes |
| Per-worktree dev server URLs | Yes | — |
| Local voice (on-device) | Yes | — |
| Self-hosted daemon | Yes | — |
See also: Pier vs Conductor, Pier vs Superset, Pier vs Happy Coder.