cmux is an open-source terminal emulator dedicated to macOS, focusing on optimizing workflows for developers who heavily rely on AI coding agents.
Key Features
Built on the ultra-fast Ghostty, cmux offers an intuitive vertical tab interface and a unique "Notification rings" feature. This feature displays colored rings around the terminal pane or tab when background tasks run by the AI agent are completed or require user intervention. This eliminates the need to constantly switch between windows to check on status.
Why it matters
As AI agents like Claude Code, Aider, or OpenCode become increasingly popular, managing multiple terminal sessions simultaneously can get overwhelming. cmux solves this problem by providing visual indicators instead of relying solely on text output or sound alerts. For the developer community, especially those frequently working with cloud infrastructure and automated scripts, cmux is a highly useful tool to boost productivity without distraction. The project currently supports installation via a .dmg file downloaded directly from GitHub.