dev-3.0vsOpenChamber
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
dev-3.0
h0x91b · Agent harness
OSS
Panel
6.30 spec wins
- Reliability
- 6.0
- Usefulness
- 6.5
- Cost
- 7.7
- Longevity
- 5.2
“Your coding agents are now cards on a Kanban board, which means they will be moved to Done by someone who has not read them.”
OpenChamber
OpenChamber · Agent harness
OSS
Panel
6.32 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 | dev-3.0 | OpenChamber |
|---|---|---|
| Architecture | ||
| Category | Agent harness | Agent harness |
| Runs | local | local |
| Platforms | macos, linux, windows | macos, linux, windows, web |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | No | No |
| MCP server | No | No |
| Capabilities | ||
| Runs terminal commands | Yes | YesCommand execution happens in the OpenCode agent OpenChamber launches; OpenChamber lets you reattach to a running terminal from any paired device. |
| Multi-file edits | YesFiles are changed by the agent running in each card's worktree, not by dev-3.0 itself. | Yes |
| Git operations | YesEvery card is a real git worktree and branch; the agent opens the pull request and enables auto-merge, and the card then shows the PR number and CI state. | 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 | Yes | 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, Gemini, Cursor Agent, opencode | 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 | Apache-2.0 | MIT |
| GitHub stars | 301 | 11,015 |
Which one would each critic pick
| Critic | dev-3.0 | OpenChamber | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 6.5 | 6.3 | dev-3.0 — Pick dev-3.0 if you review agent work more than you write it; pick a single terminal session if you would rather do one thing properly than five things at once. |
| El Crítico | 5.8 | 5.5 | dev-3.0 — Every card cuts a fresh worktree from the same base branch, so five agents working at once produce five branches that were each written as though the others did not exist. |
| El Profesor | 6.8 | 6.8 | no preference |
| La Inversora | 5.8 | 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 | 7.3 | 6.8 | dev-3.0 — Apache-2.0 and installed with one cask, and every card is a real tmux session, so I can attach from another terminal and drive the agent without going through the app. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.