guidoA native UI runtime for any language

Build desktop apps in Bun, Python, Rust, Go, C, Zig or Nim. Your code talks to a 21 MB runtime that renders real windows and widgets.

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What is guido?

Try it right here

The engine below is the real guido runtime compiled to WebAssembly, driven live over the JSON bridge. Pick a demo or build a UI by hand from the protocol console.

+ / − / reset buttons driving a shared count.

guido

A real guido-rendered UI, compiled to WebAssembly, driven live over the JSON bridge.

Downloads the multi-megabyte engine only when you click.

Protocol consoleIdle

No traffic yet. Launch the playground to see messages.

Send a raw bridge message (object or array). In Blank mode, build a whole UI by hand.

Installs as a package

npm install guido-sdk or pip install guido-sdk includes the runtime. connect() finds it without configuration. A tarball covers other languages.

Logic stays in your language

The runtime renders the UI and reports events. Application code, dependencies and tooling stay in the language you already use.

Visual UI design is optional

Lay out screens in the Godot editor and drive them by node name, or create every widget from code. Both are supported.

Small runtime

One 21 MB binary (8 MB compressed) instead of a bundled browser. Apps start in under a second and can ship as a single file.