cmux vs Devin
Devin is an AI software engineer for planning and executing engineering tasks across codebases and team tools. cmux is the local native terminal and browser workspace for supervising the CLI agents, shells, tests, and browser checks you run yourself.
Local supervision vs delegated software engineering
Use Devin when you want to assign engineering work to a managed agent platform. Use cmux when you want the most productive local loop: a free, open source terminal that keeps Claude Code, Codex, OpenCode, Gemini CLI, Aider, SSH, scripts, notifications, and browsers visible on your Mac with native performance and a programmable socket.
| Dimension | cmux | Devin |
|---|---|---|
| Primary job | Supervise local terminal and browser workflows | Plan and execute delegated engineering tasks |
| Desktop stack | Native Swift/AppKit macOS app built on libghostty | Devin Cloud plus VS Code-fork Devin Desktop |
| Where work runs | Your Mac, shell, repos, and dev environment | Devin Cloud VMs, plus local Devin CLI and Devin Local |
| Source model | Free and open source GPL app | Proprietary Cognition service and desktop software |
| Agent choice | Any CLI agent or shell tool | Devin Cloud, Devin Local, Devin CLI, and ACP-compatible agents |
| Human review | Unread rings, panes, screenshots, browser checks, local diffs | Platform review and integration flow |
| Best fit | Developers running many local agents | Teams delegating larger tasks to a managed AI engineer |
cmux is the operator console for local work
cmux does not try to be the engineer. It gives you the local workspace where agent sessions, tests, logs, dev servers, browsers, SSH panes, notification rings, Cmd+Shift+U, and Cmd+Control+U stay visible and controllable.
Bring multiple agents instead of one platform
You can run Claude Code for one task, Codex for another, OpenCode for a third, and ordinary shell commands next to them. cmux keeps the supervision layer in your terminal and browser workspace, outside the Devin app and cloud workflow.
Local work stays fast and inspectable
For many tasks, the most productive loop is still local: edit, run, inspect, ask another agent, open the browser, and push when the diff is ready. cmux keeps that loop on your Mac instead of making every task a managed Devin Cloud session.
Native Mac performance under concurrency
Parallel agent work is resource-heavy before the UI enters the picture. cmux uses Swift/AppKit and libghostty so the terminal surface stays lean while local processes do the work.
Programmability keeps workflows inspectable
The cmux CLI and socket API expose panes, workspaces, screen reads, screenshots, browser automation, hooks, and custom commands. Teams can script the exact workflow they need around local agents.
FAQ
Does cmux replace Devin?
No. Devin spans cloud delegation and local agent assistance. cmux is the local terminal and browser workspace around the agents and tools you run directly.
Can I use cmux with Devin Desktop or Windsurf?
Yes. cmux can sit beside any editor or desktop agent surface while it supervises CLI agents, shells, tests, and browser checks.
Why compare cmux with Devin?
Both address multi-agent development, but at different layers. cmux is a terminal and browser control plane; Devin spans cloud delegation, local agents, and a VS Code-fork IDE command center.