Cmux Freemium

What it does

cmux is a native macOS terminal, built on libghostty, designed around running several AI coding agent sessions side by side rather than as an afterthought bolted onto a generic terminal. Vertical and horizontal tabs, per-pane notifications, and a sidebar showing git/PR/port state are all built for juggling many concurrent agents.

What is inside

• Blue notification rings and highlighted tabs when an agent pane needs attention, plus a dedicated notification panel
• Sidebar with git branch, PR status, working directory, and listening ports per pane
• Vertical and horizontal split panes with directional navigation
• A scriptable in-app browser pane with DOM snapshots and JS evaluation
• SSH support that routes browser panes through the remote network so localhost just works
• Native "Claude Code Teams" teammate mode without tmux
• Session restore of layout, working directories, scrollback, and browser history on relaunch
• A CLI and Unix socket API for automation

Works with

Any terminal-based coding agent, with native resume integrations for Claude Code, Codex, OpenCode, Gemini CLI, Kiro, Aider, Goose, Amp, Cline, Cursor Agent, Grok, Pi, Rovo Dev, Copilot, CodeBuddy, Factory, and Qoder.

How to install or connect

brew tap manaflow-ai/cmux
brew install --cask cmux
brew upgrade --cask cmux

A signed DMG with auto-updates via Sparkle is also available from the GitHub releases page, along with nightly builds.

Pricing

The core terminal is free and open source (GPL-3.0-or-later); the project's own site states "cmux is free to use." A separate paid tier, cmux Founder's Edition, unlocks early access to the iOS companion app, "cmux AI," and hosted Cloud VMs, but cmux does not publish a price on its site for that tier - you have to follow the Founder's Edition link from the homepage to see current terms.

Maintenance and safety

Open source under GPL-3.0-or-later (commercial licensing available separately) with over 27,000 stars, 2,400 forks, and 16,000+ commits - a very active project, though the open issue/PR count is high for its size. Because it launches and manages multiple agent CLIs with shell, git, and browser access, treat it like any terminal that runs agents with real permissions on your machine.

Who should use it

macOS developers running multiple CLI coding agents in parallel who want notification, git, and PR context built into the terminal itself instead of stitched together with tmux and shell scripts.