LuneDesktop apps for Crystal

Expose Crystal methods to a web frontend with zero boilerplate. One binary. Typed API. Hot reload.

Zero-boilerplate bridge

Annotate a Crystal method with @[Lune::Bind] and it is automatically available as a JavaScript function — no IPC wiring, no serialization code.

Lune generates App.d.ts alongside every build. Your frontend gets full autocomplete and type safety derived directly from Crystal method signatures.

The frontend is compiled into the Crystal binary at build time. Ship one file — no Electron, no Node runtime, no bundled Chromium.

lune dev starts your Vite dev server and Crystal backend together. Save a file and the frontend reloads instantly; change Crystal and it recompiles.

Uses the native WebView on each platform — WKWebView on macOS, WebKitGTK on Linux. No extra runtime to install.

Works with any Vite-based frontend — Vanilla JS, Vue, React, Svelte. Templates for Vanilla and Vue ship out of the box.