cmux — Raw Ingest

2026-06-21 · source · source ↗ · raw capture · wiki page

Fetched from https://cmux.com/ on 2026-06-21.

Product

cmux is a macOS-native terminal application designed for developers working with AI coding agents and multitasking workflows. Built on libghostty (the terminal rendering engine from Ghostty) — explicitly "not a fork of Ghostty" but uses its rendering library similarly to how apps use WebKit.

Written in native Swift + AppKit — "no Electron." GPU-accelerated rendering via libghostty. macOS only.

Features

Vertical tabs in a sidebar showing git branch, working directory, ports, and notification text
Notification rings — panes visually highlight when processes need attention, with unread badges, a notification popover, and macOS desktop notifications (triggered via OSC 9/99/777 escape sequences or the cmux CLI)
In-app browser that can be split alongside the terminal, with a scriptable API
Split panes (horizontal and vertical) within each tab
CLI and socket API for automation and scripting
Keyboard shortcuts for workspaces, splits, browser, and more (terminal keybindings come from a Ghostty config file at ~/.config/ghostty/config; cmux-specific shortcuts are customizable in Settings)

Terminal Compatibility

Any agent that "runs in a terminal works out of the box," including Claude Code, Codex, OpenCode, Gemini CLI, Kiro, Aider, Goose, Amp, Cline, Cursor Agent, and others.

Maker

Created by Manaflow (references manaflow-ai on GitHub, contact founders@manaflow.com). No individual founders named.

Pricing

Free — source code available on GitHub. No paid tiers.

Positioning vs. Alternatives

vs. Ghostty: cmux is a different app using Ghostty's rendering engine as a library
vs. tmux: tmux "is a terminal multiplexer that runs inside any terminal" whereas cmux is a native macOS GUI app with vertical tabs, split panes, embedded browser, and socket API — no config files or prefix keys needed
vs. iTerm2, Warp, VSCode: Multiple community testimonials describe switching from these tools

Other

Translated into 20+ languages. Site includes changelog, blog, nightly builds, community links (GitHub, X/Twitter, Discord), and standard legal pages.