ACP UIvsOpenChamber
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
ACP UI
Jun Han · Agent harness
OSS
Panel
6.30 spec wins
- Reliability
- 5.8
- Usefulness
- 5.7
- Cost
- 8.3
- Longevity
- 5.2
“There is an Android build, so you can now approve a file write from the bus and regret it before your stop.”
OpenChamber
OpenChamber · Agent harness
OSS
Panel
6.34 spec wins
- Reliability
- 6.2
- Usefulness
- 6.5
- Cost
- 6.0
- Longevity
- 6.5
“Prompts can be scheduled daily, weekly or on a cron, so the agent can now disappoint you on a timetable.”
Spec by spec
| Spec | ACP UI | OpenChamber |
|---|---|---|
| Architecture | ||
| Category | Agent harness | Agent harness |
| Runs | local | local |
| Platforms | macos, linux, windows, web | macos, linux, windows, web |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | No | No |
| MCP server | No | No |
| Capabilities | ||
| Runs terminal commands | YesAs the ACP client, ACP UI executes the terminal commands the agent requests and shows their output; the desktop build only, since the browser cannot spawn processes. | YesCommand execution happens in the OpenCode agent OpenChamber launches; OpenChamber lets you reattach to a running terminal from any paired device. |
| Multi-file edits | YesFile reads and writes are performed by ACP UI on the agent's behalf against the host workspace, and only on desktop. | Yes |
| Git operations | No | YesMulti-run can put each parallel session in its own git worktree, and GitHub sessions can update or merge a pull request from inside OpenChamber. |
| Browser control | No | YesPreview opens the running app beside the conversation, and the desktop build has a built-in browser that can send an element's screenshot, styles and console errors to the agent. |
| Sandboxed execution | No | No |
| Multi-agent orchestration | No | YesMulti-run gives one task to up to five models at once and Fusion merges the best parts of their results. |
| Headless / CI mode | No | No |
| Models | ||
| Backbone | Claude Code, Codex, GitHub Copilot, Gemini CLI, Qwen Code, OpenCode, OpenClaw, Kiro CLI, any ACP-compatible agent | OpenCode |
| Bring your own model | Yes | Yes |
| Local models | No | No |
| Cost | ||
| Pricing model | byok | byok |
| Starts at | $0/mo | $0/mo |
| Free tier | Yes | Yes |
| Bring your own key | Yes | Yes |
| Openness | ||
| Open source | Yes | Yes |
| License | MIT | MIT |
| GitHub stars | 491 | 11,015 |
Which one would each critic pick
| Critic | ACP UI | OpenChamber | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 6.5 | 6.3 | ACP UI — Pick it if you rotate between several ACP agents and want one habit instead of five; stay with the vendor's own client if you have settled on one. |
| El Crítico | 6.0 | 5.5 | ACP UI — It runs no agent of its own, so every capability listed belongs to somebody else's binary, and a lagging protocol implementation upstream turns this into an empty window. |
| El Profesor | 6.5 | 6.8 | OpenChamber — A goal is checked after every turn and the loop continues until it is met, blocked, or a limit is reached, which is a stated termination condition. |
| La Inversora | 5.5 | 6.5 | OpenChamber — 9,556 stars and over twenty-three thousand editor installations from a repository that did not exist before September 2025, with nothing charged for any of it. |
| La Jefa | 6.0 | 6.0 | no preference |
| El Hacker | 7.0 | 6.8 | ACP UI — MIT, a Tauri shell small enough that one person can fork it, and my own agent keys stay where they are; there is no MCP here, so the extension point is elsewhere. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.