Yes, the creation/edition process must happen on macOS but the produced file may be exported as a text file and you get the original file and as such you are no

Yes, the creation/edition process must happen on macOS but the produced file may be exported as a text file and you get the original file and as such you are not locked in a proprietary format. To me it looks different than other image editing software. I mean, you could make the drawing without monopic with a text editor, it is just a convenience, but it is a really good one.