Fairly sure it’s Mac only. It’s not a 1:1 replacement, but is similar enough for someone like me who’s used Photoshop for 25+ years to pick up quickly.
Whereas I often find myself having to search through help pages and forums when using Affinity Photo.
For many years I didn’t consider a computer a computer until it had Photoshop on it, but since moving to Pixelmator, Affinity and Figma I’ve been able to ditch Adobe completely.
Photoshop’s workflows are etched into my muscle memory, so while I like Affinity Photo, it’s just different enough to be frustrating.
Pixelmator Pro on the other hand works exactly how I expect. It’s quick, fully featured and just plain pleasant to use. Thoroughly recommended.