A macOS 26+ native terminal application built on libghostty with Liquid Glass UI.

• libghostty terminal engine -- Metal GPU-accelerated rendering via Ghostty v1.3.0 submodule
• Liquid Glass UI -- native macOS 26 Tahoe design language
• Tab Groups -- 10 color presets, collapsible sections, hierarchical organization
• Split Panes -- horizontal and vertical splits with directional focus navigation
• Command Palette -- search and execute all operations with Cmd+Shift+P
• Session Persistence -- tabs, splits, and working directories auto-saved and restored on restart
• Desktop Notifications -- OSC 9/99/777 support with rate limiting
• Browser Integration -- WKWebView tabs alongside terminal tabs (http/https only, non-persistent storage, popup blocking)
• Scrollback Search -- Cmd+F to search terminal scrollback with match highlighting, Cmd+G/Cmd+Shift+G to navigate matches
• Native Scrollbar -- system overlay scrollbar for terminal scrollback
• Cursor Click-to-Move -- click on a prompt line to reposition cursor (requires shell integration)
• Git Source Control -- sidebar Changes view with working changes (staged/unstaged/untracked), commit graph with branch visualization, and inline diff viewer
• Claude Code IPC -- MCP server for communication between Claude Code instances across tabs and panes (demo video)
• Ghostty config compatibility -- reads ~/.config/ghostty/config (most keys hot-reload on save; see Settings for Calyx-managed keys)
• Auto-update -- Sparkle-based updates for direct downloads (Homebrew installs use brew upgrade)

Multiple Claude Code instances running in different Calyx tabs or panes can communicate with each other via a built-in MCP server.

1. Open the command palette (Cmd+Shift+P) and run Enable Claude Code IPC
2. Start Claude Code in two or more terminal panes
3. Each instance automatically registers as a peer and can send/receive messages

Available MCP tools: register_peer, list_peers, send_message, broadcast, receive_messages, ack_messages, get_peer_status

To disable, open the command palette and run Disable Claude Code IPC.

brew tap yuuichieguchi/calyx
brew install --cask calyx

1. Download Calyx.zip from the latest release
2. Unzip the file
3. Drag Calyx.app into /Applications

Direct downloads include automatic update checking via Sparkle. Homebrew installs are updated via brew upgrade.

• macOS 26+ (Tahoe)
• Xcode 26+
• Zig (version matching ghostty's build.zig.zon)
• XcodeGen (brew install xcodegen)

# Clone with submodules
git clone --recursive https://github.com/yuuichieguchi/Calyx.git
cd Calyx # Build libghostty xcframework
cd ghostty
zig build -Demit-xcframework=true -Dxcframework-target=native
cd .. # Copy framework
cp -R ghostty/macos/GhosttyKit.xcframework . # Generate Xcode project & build
xcodegen generate
xcodebuild -project Calyx.xcodeproj -scheme Calyx -configuration Debug build

Calyx uses AppKit for window, tab, and focus management with SwiftUI for view rendering, bridged via NSHostingView.

• All ghostty C API calls go through the GhosttyFFI enum
• @MainActor enforced on all UI and model code
• Action dispatch via NotificationCenter

Tech stack: Swift 6.2, AppKit, SwiftUI, libghostty (Metal), XcodeGen

• Cursor click-to-move on full-width text -- cursor placement may be offset on Japanese/full-width text lines because Ghostty's cursor-click-to-move internally translates clicks into arrow-key steps over terminal cells.
• Calyx-managed config keys -- background-opacity, background-blur, font-thicken, minimum-contrast, background-opacity-cells, font-codepoint-map are overridden by Calyx for Glass UI. See Settings > Ghostty Config Compatibility for the full list.

This project is licensed under the MIT License.

Built on libghostty by Mitchell Hashimoto (MIT License).