Looks really good!
So this is not related to NXP’s GUI Builder right?
Does it support setting custom screen resolutions, color modes and edit styles via themes (ie, not having to edit manually every widget to follow a given style)?
Does this generate C code?
Not yet, but a “style editor” (to create reusable style) will be part of the first release.
Yes, C and MicroPython.
Regarding OS: yes, Linux and Windows for sure. We are evaluating OSX.
Regarding MCU manufacturer: Also yes, but we are still working on the business model.
We are still fixing polishing it and will publish a beta version soon.