Cmux

cmux A Ghostty-based macOS terminal with vertical tabs and notifications for AI coding agents

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▶ Demo video · The Zen of cmux

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Features

• Browser import — Import cookies, history, and sessions from Chrome, Firefox, Arc, and 20+ browsers so browser panes start authenticated
• Custom commands — Define project-specific actions in cmux.json that launch from the command palette
• Programmable — CLI and socket API to create workspaces, split panes, send keystrokes, and automate the browser
• Native macOS app — Built with Swift and AppKit, not Electron. Fast startup, low memory.
• Ghostty compatible — Reads your existing ~/.config/ghostty/config for themes, fonts, and colors
• GPU-accelerated — Powered by libghostty for smooth rendering
• Keyboard shortcuts — Extensive shortcuts for workspaces, splits, browser, and more
• Open source — Free and GPL-licensed

Install

DMG (recommended)

Open the .dmg and drag cmux to your Applications folder. cmux auto-updates via Sparkle, so you only need to download once.

Homebrew

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

To update later:

brew upgrade --cask cmux

On first launch, macOS may ask you to confirm opening an app from an identified developer. Click Open to proceed.

Why cmux?

I run a lot of Claude Code and Codex sessions in parallel. I was using Ghostty with a bunch of split panes, and relying on native macOS notifications to know when an agent needed me. But Claude Code's notification body is always just "Claude is waiting for your input" with no context, and with enough tabs open I couldn't even read the titles anymore.