While drinking my first cup of coffee this morning, I took a look through the connection log for Hogewash! for the last couple of thousand logins. There were 9 folks still using XP and one connection each from users of Vista, Windows 8, and FreeBSD i686.
The two most popular systems were Windows 10.0 and iOS 11.2.4. Together, they accounted for about half the connections.
FWIW, the machine I usually use to create this site is currently running MacOS 10.13.4.