I've been using the blend project and the autocomplete is great. But there seem to be subtle differences in unity. Like I can reference other unity classes but then they will show an error in the blend project. There's also certain errors, that only show up in the blend project and cause stuff not to render like this one:

'StaticResourceExtension' is not valid for Setter.Value. The only supported MarkupExtension types are DynamicResourceExtension and BindingBase or derived types.

What's the best experience for getting autocomplete and errors for the unity code without the blend. Is it the visual studio code plugin? Would Noesis GUI Studio work?

Yes, our Visual Studio Code plugin is the recommended option because it uses NoesisGUI internally. For example, in Unity, it connects to the editor and utilizes our plugin to retrieve information about types. Error descriptions also come from Noesis, providing a better experience compared to Blend.

In Noesis 3.2.4, we added support for StaticResource and DynamicResource, and more features are coming in 3.2.5, including support for autocompletion in bindings. The plugin is still a work in progress.

And yes, the plugin will be 100% compatible with Noesis Studio.

Thanks for the info! In visual studio code I just need this plugin and the unity one?

The VSCode plugin can used independently, it comes with a embedded server. But if you want to connect to your Unity or Unreal project, you will need NoesisGUI there too.