I found changing it to dpi / 192.0 to be fairly comfortable. It wouldn't be too hard to add a scale option and change to `return (dpi * scale) / 192.0`. The "right way" is probably to do that but also get scale by checking the screen resolution; I'd go by height due to the increasing adoption of ultra-wide monitors:
it creates a 348K "Mach-O 64-bit executable x86_64", but I'm not sure how I would add that to the dock. I tried to drag it there with finder, but it would not take it.
Nice project. Would be nice to change the key binding on mac to use the Command key instead of control. It is one of those habit and mental shift when using mac vs linux/windows.