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cmux

Agentic development environmentsManaflow

cmux is a native terminal workspace with agent notifications, split panes, and programmable session controls.

Visit cmuxSee the Agentic development environments shortlist
  • Native macOS terminal
  • Built on Ghostty
  • Free (GPL)
  • Y Combinator-backed

At a glance

28,762 GitHub starsVerifiedAs of Nov 11, 2026GitHub repository

How we rank

Evidence notes
  • Evidence level: Verified, primary.
  • Stars are the measure. The macOS app is GPL; some server code is source-available.
  • Up from about 25,600 on Aug 4 (Wayback Machine snapshot), the slowest growth of the open-source group.

Key facts

As of Nov 11, 2026

Who it's for
Developers supervising terminal agents from a native workspace.
What is it built on?
A free native macOS terminal in Swift and AppKit that uses libghostty for rendering. It has vertical tabs, notification rings when an agent needs you, split panes, a scriptable in-app browser and a CLI and socket API.
Where do the agents run?
On your Mac. You can open workspaces over SSH and attach to remote tmux sessions. cmux Pro adds Cloud VMs and an iOS companion in early access.
Can you run several agents at once?
Yes. It restores panes and agent sessions, and turns subagents into visible panes. Its page does not describe worktree handling, so you manage branches yourself.
Which models and agents can it use?
Any agent that runs in a terminal, including Claude Code, Codex, OpenCode, Gemini CLI, Kiro, Aider, Goose, Amp, Cline and Cursor Agent.
What do the plans cost?
The terminal is free. Pro is $50 a month, Max $200 a month and Team $60 per user a month, for cloud capacity and early access.
How does billing work?
Free terminal; paid plans add cloud capacity. You use your own agent subscriptions.
How many people use it?
28,762 GitHub stars on Nov 11, 2026, up from about 25,600 on Aug 4. The site quotes users including Peter Steinberger and Nick Schrock.
How big is the company?
Built by Manaflow, Inc., which also launched on Y Combinator and Hacker News in early 2026. The macOS app is GPL-3.0-or-later; some server directories are under the Business Source License.
Sources

Common questions

What is cmux?

cmux is a native terminal workspace with agent notifications, split panes, and programmable session controls.

Who is cmux for?

Developers supervising terminal agents from a native workspace.

How much does cmux cost?

The terminal is free. Pro is $50 a month, Max $200 a month and Team $60 per user a month, for cloud capacity and early access. Checked against the vendor's pages on Nov 11, 2026. Plans change often, so confirm before you decide.

Does cmux run locally or in the cloud?

cmux runs on your machine. You use it through a terminal and an editor.

What are alternatives to cmux?

Other agent workspaces in the directory: T3 Code, Orca, Paradev (formerly Superset), Conductor, Emdash Classic, Nimbalyst, Schaltwerk, Vibe Kanban. Different categories solve the same problem differently, so see the Agent workspaces category page for tradeoffs.

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