Calyx is a macOS 26+ native terminal application built on libghostty's Metal GPU-accelerated engine. The app features Liquid Glass UI design, tab groups with 10 color presets, and split panes with directional focus navigation. Built with Swift 6.2 and AppKit, Calyx offers a modern terminal experience while maintaining compatibility with Ghostty's configuration system.

Key features include command palette access via Cmd+Shift+P, session persistence that auto-saves tabs and splits, and desktop notifications through OSC protocol. The terminal supports WKWebView tabs alongside traditional terminal tabs, scrollback search with Cmd+F, and a native scrollbar for terminal output. Git source control integration provides a sidebar Changes view with working changes, commit graph visualization, and inline diff viewing.

Calyx includes unique Claude Code IPC capabilities, allowing multiple instances to communicate across tabs via a built-in MCP server. Users can enable this feature through the command palette to register peers and send messages between panes. The application requires macOS 26+ and Xcode 26+, with building from source needing Zig and XcodeGen. Known limitations include potential cursor offset on full-width text lines. Licensed under MIT, Calyx represents a sophisticated terminal solution for macOS users seeking GPU acceleration and modern UI design.