This is a small project so converting it from Xojo to SwiftUI didn’t take long. The Xojo version was 20mb, the SwiftUI version is only 1.9mb. I had to create a custom grid control for the Xojo version, where as with SwiftUI I used the built-in LazyVGrid and a Scrollview.
I’m still working my way through the marketing, but I am eager to demo my handiwork with SwiftUI.
had to smile about your sentence “100% Mac Native”
Does Xojo not claim it’s native to every OS 
Looking at their web site, they do indeed claim to have native controls, I can confirm that some of the controls are indeed native, but not all of them, the listbox for instance is NOT a native TableView on the macOS.
Right
while it is “native” in that its made from other native elements its not a table view or list view on each platform
Its their own custom C/C++/Objective C code
so native is … suspect
Congratulations Sam, on your website I especially loved the callout “90% Less Waste”, as a smart marketing play.
Kind regards, Andrew
They’re not lying, but they’re not telling the whole truth either. It should have an asterisk next to Native and further details below. But that would certainly put some people off.
Thank you, you have to use whatever you can to make the product sound exceptional, and in this case the fact that the SwiftUI version is smaller, is an advantage. I also snuck in that Swift is a US government memory-safe approved language 
well I guess everything not coming from the USA is considered as US government unsafe language in these days
(proud, not to be dependend on Microsoft, Apple or Google, typing from a GNU/Linux Debian)