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

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▶ Demo video · The Zen of cmux

Docs · Blog · Changelog · Community

Notification rings Panes get a blue ring and tabs light up when coding agents need your attention
Notification panel See all pending notifications in one place, jump to the most recent unread
In-app browser Split a browser alongside your terminal with a scriptable API ported from agent-browser
Vertical + horizontal tabs Sidebar shows git branch, linked PR status/number, working directory, listening ports, and latest notification text. Split horizontally and vertically.
SSH cmux ssh user@remote creates a workspace for a remote machine. Pass --command 'omp "investigate auth"' to run an initial command once in its first remote terminal. Browser panes route through the remote network so localhost just works. Drag an image into a remote session to upload via scp.
Claude Code Teams cmux claude-teams runs Claude Code's teammate mode with one command. Teammates spawn as native splits with sidebar metadata and notifications. No tmux required.

• 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