Every [*] macOS user uses Rectangle.app — https://rectangleapp.com

The ones who don't use it is because they don’t know it exists.

Or they are still using the (deprecated) Spectacle.app — https://github.com/eczarny/spectacle

[*] if you wonder why I say “every user” even though it’s obviously not true is because everyone loves hyperbole in this website.

I can prove everyone doesn't love hyberbole because I have found a counterexample, but I cannot prove everyone doesn't use Rectangle.app.