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cmux

cmux is a native macOS terminal application built with Swift/AppKit that features vertical tabs, notifications system, and in-app browser specifically designed for managing multiple AI coding agents.

What is cmux

cmux is an open-source terminal application that reimagines how developers interact with AI coding agents. Built as a native macOS app using Swift and AppKit, it integrates Ghostty for terminal rendering while adding crucial features like vertical tabs, notification systems, and an in-app browser. The application was created to solve the challenges of managing multiple AI coding sessions simultaneously, such as those from Claude Code, Codex, OpenCode, and other coding CLIs, while maintaining high performance and user flexibility.

Key Features of cmux

cmux is a native macOS terminal application that combines Ghostty-based terminal emulation with vertical tabs, notifications, and an integrated browser specifically designed for AI coding agents. It features GPU-accelerated rendering, scriptable CLI and socket APIs, and seamless integration with existing Ghostty configurations while providing visual context through git branch information, PR status, and workspace notifications. Notification System:Features blue rings around panes and illuminated tabs when AI agents need attention, with a centralized notification panel and quick-jump functionality to the most recent unread notifications Integrated Browser with API:Includes a built-in browser that can be split alongside terminals, with a scriptable API compatible with agent-browser for automation and testing Smart Vertical Tabs:Displays contextual information including git branch, PR status, working directory, and listening ports in a vertical sidebar for better workspace organization Native Performance:Built with Swift and AppKit instead of Electron, utilizing GPU acceleration through libghostty for smooth rendering and fast startup times

Use Cases

AI Development Workflow: Manage multiple AI coding agents (Claude Code, Codex, etc.) simultaneously while maintaining clear visual feedback on their status and requirements Full-Stack Development: Run development servers, view results in the integrated browser, and manage git operations all within the same window with split panes Code Review and Testing: Review AI-generated code changes across multiple tasks with integrated preview environments and automated testing capabilities Multi-Project Management: Organize multiple projects with distinct workspaces, each showing relevant git information and development status at a glance

Pros

High performance native macOS app with GPU acceleration Extensive scriptability through CLI and socket API Seamless integration with existing Ghostty configurations

Cons

Limited to macOS platform only Does not restore live process state after restart Requires manual configuration for some AI agent integrations

How to Use cmux

Install cmux: Download and install cmux either by downloading the .dmg file from GitHub releases and dragging it to Applications folder, or using Homebrew with command: 'brew tap manaflow-ai/cmux && brew install --cask cmux' Launch cmux: Open cmux from Applications folder. On first launch, macOS may show a security warning - click 'Open' to proceed. The app will auto-update via Sparkle. Create workspaces: Use Cmd+N to create new workspaces (tabs). Each workspace shows git branch, working directory, ports and notifications in the sidebar. Use Cmd+1-8 to switch between workspaces. Split panes: Use Cmd+D to split panes horizontally (right) or Cmd+Shift+D to split vertically (down). Navigate between panes using Option+Cmd+Arrow keys. Use browser integration: Press Cmd+Shift+L to open browser in split pane. Use Cmd+L to focus address bar. The browser supports developer tools (Option+Cmd+I) and console (Option+Cmd+C). Monitor notifications: When AI agents need attention, panes get blue rings and tabs light up. Press Cmd+I to show notifications panel, Cmd+Shift+U to jump to latest unread notification. Customize appearance: cmux reads themes, fonts and colors from ~/.config/ghostty/config file. Open Settings (Cmd+,) to customize keyboard shortcuts and other preferences. Use CLI automation: cmux provides CLI and socket API to automate workspace creation, pane splitting, keystrokes, and browser control. Use 'cmux notify' to integrate with AI agent notifications.

cmux FAQs

1.What is cmux?

cmux is a Ghostty-based macOS terminal app with vertical tabs and notifications designed specifically for AI coding agents. It provides a terminal, browser, notifications, workspaces, splits, tabs, and a CLI to control all of it.

2.How do I install cmux?

There are two ways to install cmux: 1) Download the DMG file from the official release and drag cmux to Applications folder (recommended), or 2) Use Homebrew by running 'brew tap manaflow-ai/cmux' followed by 'brew install --cask cmux'

3.Is cmux free and open source?

Yes, cmux is free and open source, licensed under the GNU Affero General Public License v3.0 (AGPL-3.0). There is also a paid Founder's Edition that offers early access to upcoming features and additional support.

4.Does cmux restore sessions after restart?

cmux partially restores sessions - it restores app layout and metadata including window/workspace/pane layout, working directories, terminal scrollback, and browser URL/history. However, it does not yet restore live process states inside terminal apps (like active Claude Code/tmux/vim sessions).

5.What makes cmux different from other terminal apps?

cmux is built as a native macOS app in Swift/AppKit (not Electron), making it fast and memory-efficient. It features a unique notification system for AI coding agents, vertical tabs showing git branch and PR status, and an in-app browser with scriptable API. It's designed as a primitive tool that doesn't force users into specific workflows.

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