Supported UI Backends

ReactUnity provides bindings to different Unity UI frameworks. We call the implementation of those UI frameworks as UI backends. React code communicates with UI backends to create the actual UI.

The three supported UI backends are:

  • Unity UI (aliased ugui)
  • UI Toolkit for Runtime (aliased uitoolkit)
  • UI Toolkit for Editor (aliased editor)

ugui and uitoolkit can be used in runtime UI, whereas editor can be used to create editor UI such as windows and inspectors.

In the React project, tsconfig.json must contain the following config in order to show correct component types. (Replace ugui with desired UI backend)

"jsxImportSource": "@reactunity/renderer/ugui"
"types": [

ugui backend can be used by adding ReactRendererUGUI component to a GameObject and configuring it via inspector. Similarly, uitoolkit backend can be used by adding ReactRendererUIToolkit to a GameObject.

In order to use the editor backend, you must extend a class from either ReactWindow, ReactInspector or ReactProperty, and then implement its GetScript method to load the React script

Comparison of UI backends

When create a runtime UI, developers have the option to either use Unity UI, or UI Toolkit. These two UI frameworks are entirely different and they have their own advantages and disadvantages.

In general, UI Toolkit has better performance while Unity UI has more flexibility. This characteristic of the two frameworks are true for ReactUnity as well. ReactUnity can extend the features of ugui to provide more features with each new version. Adding new features to uitoolkit is often not possible, since UI Toolkit does not allow such flexibility.

Also, each UI backend has its own set of supported components. For example, video tag is supported by ugui while it is not supported by others. This is just one example and there are many components like this that are incompatible between backends.

Read more

Visit these useful links to learn more about the differences between these UI frameworks: