very interesting. i wonder about the tech behind it. always wanted to get into native mac app development but objective-c is a little daunting. i wonder if it's using swift ui?
> It's mostly custom drawing on top of a customized AppKit textview. The Cocoa text system is wildly powerful, quite hard to do pixel perfect drawing with. No OpenGL or any fancy graphics libraries.
I think Swift is there now. There were some very painful migrations, but for the past 2-3 years it has been different. It is true that it's a real pain to use some C-based APIs with it, but those are pretty rare. And, often you can find a Swift wrapper for them if you really need to. I've been using ObjC for 25 years, but I'm now pretty into Swift. I'd go for it.