Not for Windows AFAIK.

[br]Android yes.

iOS ..who really cares?

Curiosity begs the question why would anyone need a Win 10 "app" when GT is designed for and works perfectly fine in a browser? Same with Justin Guitar. Like Guitar Tricks he has an Android app orientated to suit 9.7" tablet screens, but his new Win website is built to work in browsers. If you think about the Win browser screen real estate these days commonly viewed on a 27" screen and larger in at least 1080 vs that of a typical mobile device app, it just makes sense.