Introducing cmux: A Ghostty‑Based macOS Terminal with Vertical Tabs and AI‑Agent Notifications

What Is cmux and Why It Matters for macOS Power Users

For developers who spend hours juggling multiple terminal sessions, the need for a more visual, context‑aware interface has become critical. cmux answers that call by layering a modern UI on top of the fast, GPU‑accelerated Ghostty engine. It adds vertical tabs, notification rings that flash when an AI coding agent needs attention, and a split‑screen browser that can be scripted directly from the command line.

Built with Swift and AppKit, cmux avoids the performance penalties of Electron‑based alternatives while staying fully compatible with existing Ghostty configuration files—so your favorite themes, fonts, and color schemes migrate seamlessly.

Key Features That Set cmux Apart

Vertical & Horizontal Tabs

Unlike traditional terminals that rely on horizontal splits, cmux introduces a sidebar with vertical tabs. Each tab displays the current Git branch, working directory, listening ports, and the latest notification text, giving you a quick snapshot of every workspace at a glance.

AI‑Agent Notification Rings

When an AI coding assistant (e.g., Claude, OpenAI Codex) pauses for input, cmux highlights the pane with a blue ring and lights up the corresponding tab. The Notification Panel aggregates all pending alerts, letting you jump directly to the most recent unread item with ⌘⇧U.

In‑App Browser & Scriptable API

cmux ships an embedded Chromium‑based browser that can sit beside any terminal pane. Through a CLI and socket API, you can programmatically open URLs, fill forms, or even let an AI agent interact with a local dev server—turning the terminal into a full‑stack development cockpit.

Native macOS Performance

• Fast startup and low memory footprint thanks to Swift/AppKit.
• GPU‑accelerated rendering via libghostty for smooth scrolling.
• Auto‑updates through Sparkle, eliminating manual patching.

Seamless Ghostty Compatibility

All your existing ~/.config/ghostty/config settings—colors, fonts, key bindings—are respected, so migration is a single drag‑and‑drop of the .dmg file.

“cmux turned my chaotic multi‑tab workflow into a tidy, visual dashboard. I never miss a prompt from my AI assistants again.” – Lead Engineer, AI‑enhanced DevOps team

For teams looking to embed AI into their daily tooling, cmux pairs nicely with the AI agent integration capabilities offered by UBOS, creating a unified productivity stack.

How to Install cmux on macOS

Getting cmux up and running is straightforward. Choose the method that fits your workflow:

1. Install via DMG (Recommended)

1. Download the latest .dmg from the GitHub releases page.
2. Open the DMG and drag the cmux.app into your /Applications folder.
3. On first launch, macOS may warn you about an unidentified developer—click Open to proceed.
4. cmux will auto‑update via Sparkle, so you only need to download once.

2. Install via Homebrew Cask

brew tap manaflow-ai/cmux
brew install --cask cmux
# To upgrade later
brew upgrade --cask cmux

3. Post‑Installation Tweaks

• Verify that your ~/.config/ghostty/config file is being read (you’ll see your theme applied).
• Run cmux notify --test to confirm the notification ring works.
• Explore the Workflow automation studio to chain cmux commands with other UBOS automations.

Keyboard Shortcuts: Speeding Up Your Daily Flow

cmux’s shortcut map follows a logical, MECE‑structured hierarchy. Below is a quick reference you can keep open while you work.

All shortcuts are fully configurable via the ~/.config/ghostty/keybindings file, letting you align cmux with your personal ergonomics.

cmux vs. Other macOS Terminal Solutions

While iTerm2, Hyper, and Kitty dominate the macOS terminal market, cmux carves a niche by focusing on AI‑centric workflows and visual tab management.

Feature Matrix

If your workflow revolves around AI‑driven code generation (Claude, OpenAI Codex, etc.), cmux’s notification system alone can shave minutes off each iteration—time that adds up over a day of development.

For teams already invested in the Enterprise AI platform by UBOS, cmux can act as the terminal front‑end while UBOS handles model orchestration, data pipelines, and monitoring.

Explore the Source Code on GitHub

The full cmux repository, including documentation, issue tracker, and contribution guidelines, is hosted on GitHub. Developers can clone the repo, submit pull requests, or file bugs directly.

Visit the cmux GitHub repository to view the latest releases, read the changelog, and join the community of contributors.

Related UBOS Resources to Supercharge Your Workflow

While cmux handles the terminal side, UBOS offers a suite of tools that complement its capabilities:

• UBOS homepage – Overview of the platform and its AI‑first philosophy.
• UBOS platform overview – Deep dive into the modular architecture that powers AI agents.
• AI marketing agents – Build, train, and deploy marketing bots that can be triggered from cmux.
• UBOS partner program – Join a network of developers and resellers to monetize your extensions.
• UBOS pricing plans – Flexible tiers for startups, SMBs, and enterprises.
• UBOS templates for quick start – Jump‑start AI projects with pre‑built templates, including a “ChatGPT and Telegram integration” starter.
• Web app editor on UBOS – Create full‑stack web interfaces that can communicate with cmux via the socket API.
• Workflow automation studio – Orchestrate multi‑step pipelines that include terminal commands, API calls, and AI model invocations.
• AI Email Marketing – Generate copy directly from the terminal and push it to your campaigns.

Take Your macOS Terminal to the Next Level

cmux bridges the gap between a high‑performance terminal and AI‑driven development workflows. By delivering visual context, instant notifications, and a scriptable browser, it eliminates the “tab‑hell” that plagues many developers.

Ready to try it?

• Download the latest version from the GitHub release page.
• Integrate with UBOS’s AI agent framework for seamless code generation.
• Join the UBOS partner program to share custom cmux extensions and earn revenue.

Boost your productivity today—let cmux and UBOS work together to turn your terminal into a smart development hub.