WebUI FrameworkCompiled Templates. Any Backend. Interactive Web Components.

Compile HTML templates to binary at build time. Render from Rust, Node, Go, C#, or Python at 4.3× the speed of Fastify. Hydrate only what's interactive.

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Why WebUI?

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Islands Architecture

Each Web Component is an interactive island. Static content stays server-rendered with zero client-side JavaScript. Only components that need interactivity ship code to the browser.

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Compiled to Binary Protocol

Templates are compiled at build time into Protocol Buffer binaries - no parsing, no AST walking, no interpretation at runtime. Static and dynamic content are separated once and never re-analyzed.

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Language Agnostic

Render from Rust, Node, Bun, Deno, C#, Python, Go - or any language via FFI. The compiled protocol is just bytes; any backend that can read bytes and write strings can serve pages.

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Web Components

Built on native Web Components with Declarative Shadow DOM. No virtual DOM, no proprietary component model - just the web platform with style encapsulation built in. Light DOM optionally available.

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Declarative Templates

HTML for structure, CSS for styling, TypeScript for behavior - in separate files. No JSX, no template literals, no CSS-in-JS. WebUI keeps concerns separated for performance and clarity.

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Plugin System

Extensible parser and handler plugins for hydration strategies, custom directives, and framework-specific behavior. Control exactly how and when each island becomes interactive.