cmux

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

Features

• Native macOS app — Built with Swift and AppKit, not Electron. Fast startup, low memory.
• Vertical tabs — See all your terminals at a glance in a sidebar
• Notification panel — See which agents are waiting for input at a glance
• Notification rings — Tabs flash when AI agents (Claude Code, Codex) need your attention
• Lightweight — Small binary, minimal resource footprint. No bundled browser engine.
• GPU-accelerated — Powered by libghostty for smooth rendering

Install

Homebrew:

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

Or download the DMG directly.

Why cmux?

Running multiple AI coding agents? cmux helps you manage them. Instead of losing track of which terminal needs input, the notification panel shows you exactly where to look.

A native macOS app means it launches instantly, uses minimal RAM, and feels right at home on your Mac.

Keyboard Shortcuts

Workspaces

Shortcut	Action
⌘ N	New workspace
⌘ 1–8	Jump to workspace 1–8
⌘ 9	Jump to last workspace
⌘ ⇧ W	Close workspace

Surfaces

Shortcut	Action
⌘ T	New surface
⌘ ⇧ [	Previous surface
⌃ ⇧ Tab	Previous surface
⌃ 1–8	Jump to surface 1–8
⌃ 9	Jump to last surface
⌘ W	Close surface

Split Panes

Shortcut	Action
⌘ D	Split right
⌘ ⇧ D	Split down
⌥ ⌘ ← → ↑ ↓	Focus pane directionally

Browser

Shortcut	Action
⌘ ⇧ B	Open browser in split
⌘ L	Focus address bar
⌘ ]	Forward
⌘ R	Reload page
⌥ ⌘ I	Open Developer Tools

Notifications

Shortcut	Action
⌘ ⇧ I	Show notifications panel
⌘ ⇧ U	Jump to latest unread

Find

Shortcut	Action
⌘ F	Find
⌘ G / ⌘ ⇧ G	Find next / previous
⌘ ⇧ F	Hide find bar
⌘ E	Use selection for find

Terminal

Shortcut	Action
⌘ K	Clear scrollback
⌘ C	Copy (with selection)
⌘ V	Paste
⌘ + / ⌘ -	Increase / decrease font size
⌘ 0	Reset font size

Window

Shortcut	Action
⌘ ⇧ N	New window
⌘ ,	Settings
⌘ ⇧ R	Reload configuration
⌘ Q	Quit