cmux is the open-source terminal built for multitasking with coding agents. It has vertical tabs, notifications, a built-in browser, and it's built on Ghostty. When Claude Code needs you, the pane glows blue and the sidebar tells you why. No Electron/Tauri. Just Swift/Appkit.
Free
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Promoted
iTerm2
Ghostty
Hey Product Hunt!
We're Austin and Lawrence, the creators of cmux.
We run a lot of Claude Code and Codex sessions in parallel. We were using Ghostty with a bunch of split panes, and relying on native macOS notifications to know when an agent needed us. But Claude Code's notification body is always just "Claude is waiting for your input" with no context. With enough tabs open, we couldn't even read the titles anymore.
We tried a few coding orchestrators but most of them were Electron/Tauri apps and the performance bugged us. We also just prefer the terminal since GUI orchestrators lock you into their workflow, and we couldn't set up our layout the way we wanted it.
So we built cmux as a native macOS app in Swift/AppKit. No Electron/Tauri.
Vertical tabs
Blue rings around panes that need attention
Built-in browser
Based on Ghostty
It uses libghostty for terminal rendering and reads your existing Ghostty config. It also has a built-in browser with a scriptable CLI. Agents can snapshot the accessibility tree, click elements, fill forms, and evaluate JS, all from the terminal.
It’s completely free & open source (AGPL). You can grab it via Homebrew:
brew install --cask manaflow-ai/cmux/cmux
We'd love to hear your feedback or answer any questions! If you enjoy using our product, please give us a star on GitHub: https://github.com/manaflow-ai/cmux
Any plans to build a mobile app for remote monitoring?
Been using this very day, new daily driver
Ghostty was already my fave terminal, so this is just taking it to the next level. I also hate electron...Loving cmux so far! Will be excited to contribute to development going forward.
I've been using this for a while. I really enjoy it. The notifications are surprisingly a game-changer in my workflow. Highly recommend!
cmux is great
This is exactly the missing piece for an AI coding workflow! Managing parallel agent sessions usually turns into a chaotic mess of split panes and easily missed macOS notifications. The visual blue rings completely eliminate the guesswork of which agent actually needs input. Plus, keeping it native instead of relying on Electron makes the whole experience incredibly smooth. Really appreciate you building and open-sourcing such a genuinely useful tool.