Loom Official Documentation

Build full-screen Unity interfaces with HTML, CSS, Solid, and a typed bridge to C#.

Get started

Go from installation to a working typed screen.

Install Loom Add the Unity package and prepare the UI workspace. Run the sample Import Getting Started and inspect the working bridge. Build your first screen Create a Solid screen and drive it from typed C# state.

Explore Loom

Find the guide or reference for the part of the integration you are working on.

Building UI Structure screens, style layouts, work in mock mode, and add packages. Connecting Unity and UI Model typed state, actions, events, collections, and image sources. Unity integration Configure Loom UI, scenes, input, DPI, and UI dependency syncing. Shipping Prepare player builds, CI, performance, and final release checks. Debugging and Troubleshooting Inspect the live UI, run Loom Doctor, and solve common problems. Reference Look up the public API, releases, migrations, FAQs, and licenses.

What Loom gives you

The framework's scope, project shape, and intended teams.

Loom lets you build Unity game UI with HTML, CSS, and JavaScript instead of UI Toolkit’s USS dialect or uGUI’s prefab graph. Your UI is a normal Vite + Solid app, and your C# code drives it through a typed bridge generated from a plain C# class.

What you get

A Unity package (onl.snack.loom) with the C# runtime, source generator, platform plugin, and Editor menus that handle setup.
Bundled UI packages (@loomgui/bridge and @loomgui/vite-plugin) that are installed into your UI app with Tools > Loom > Sync UI Dependencies.
A typed bridge between C# and the UI. C# exposes state, actions, and events; the UI consumes generated TypeScript types.
An importable Getting Started sample that proves reactive state and a UI-to-C# action using only files shipped in the package.

Who it’s for

Loom fits Unity teams that want web-quality UI iteration, layout, typography, and animation inside their game. It works especially well when:

Your UI team is already comfortable with HTML, CSS, and TypeScript.
You want hot reload and browser devtools while the game is running.
You need complex menus, HUDs, overlays, data views, or live-ops surfaces.
You want a clean contract between gameplay code and UI code.

What Loom is not

A replacement for Unity rendering, scene UI, or world-space interaction.
A general embedded browser API for arbitrary public websites.
A no-code UI builder.

Next steps

Check Supported platforms.
Read How Loom fits if you want the project shape before installing.
Follow Install Loom or Run the sample.