It's an interesting idea, but it's hard to tell what the native parts are. The home page has a section titled "Native Targets" with an arrow icon that looks like it'd go to some docs, but appears to just be an icon. The running example is a straightforward responsive web page. The docs are centered around UI components for this tool and the lack of a Tree component really makes it look like this is a web framework.

Does it actually generate a native mobile or desktop application? I probably overlooked it, but I couldn't find an example app to build and experiment with locally.