Looks like a DSL for UI. Interesting.

I entered "CRUD for public book library" in their playground (https://www.openui.com/playground) and it generated some forms which looks useful:

https://i.imgur.com/gd2XzoD.png

I'd have to investigate more about the customizability of it. For example, how hard is it to implement custom form validations? This sort of thing.

Also, how many dependencies and layers I would be adding to my project for using it.