With the dawn of Apple Silicon, it's now possible to run the iOS version of WSPR Watch directly on a Mac. It works very well and looks pretty much the same as the macOS version I made with Catalyst. Here's the two side by side:
The native iOS version is the one on the left. For now, I'm leaving the Catalyst version in the App Store for people who haven't moved to Apple Silicon yet.
There have been a few bug fix releases recently. One issue was that the map stopped working on macOS Catalina, not because of something I did but because of a change in Xcode. If your map isn't showing, grab the latest version.