SwiftTUI

SwiftTUI is a Swift framework for building terminal user interfaces on macOS, Linux, and Windows. You write View types with @State, stacks, controls, focus, gestures, and animation — the declarative model SwiftUI has proven at platform scale — and the framework owns layout, input, redraw, and the terminal itself. The result is one fast native binary.

Why SwiftTUI?

• State in, screen out. Views are a pure function of your app's state: change a value and the runtime recomputes layout and rewrites exactly the cells that changed. No draw loop, no buffer diffing, no repaint bookkeeping.
• The terminal, negotiated for you. Truecolor, Kitty and Sixel images, OSC 8 hyperlinks, and mouse reporting are probed per session and degrade gracefully: one binary is correct in kitty, a bare SSH session, or CI. Every app also ships --accessible, --cursor-follows-focus, --reduce-motion, --no-color, and --ascii. You write views, not escape codes.
• One compiled binary, testable without a TTY. Swift 6 compiles your interface into a single executable with checked concurrency, and tests render and compare integer-cell frames like the one above with no terminal attached.