You're question is unclear, but you probably mean Desktop
The ubiquitous formulation is "this dotcom works on both Desktop or Mobile!" or "We have apps for Desktop and Mobile!"
Another formulation (if for some reason you don't want to say what everyone else does, "desktop or mobile") is just "For Mac/Windows, or, Mobile". So you can use "Mac/Windows".
Just regarding "desktop". Not unreasonably, DB has pointed out that, say, 295 years ago, people referred separately to "Lap-Tops" :)
Don't forget - if I tell you "this [whatever] is for a desktop", then of course, obviously, that same software or hardware also runs on a "Lap-Top".
So again, it's totally normal to say "Desktop or Mobile" and this would be why you can find a million goole hits for that, including, it's the language google's ad agency uses
And finally here's a link to the all time classic
SHROVIS-BISHOPTHORPE Envaliant III
sequence, since you may have misplaced yours.