I have an app on my phone, Garage Band, and I play a little on the piano keyboard. It's glitchy, I can't see and make mistakes when I try to touch specific notes, but I don't care. 'Near Enough is Good Enough' is my policy, and can produce some rather nice results. I would prefer the app to work better thogh, because then using it would not be so frustrating, which is not what I want when I want to use it! I want to relax.
Sometimes, it is very good for that, when it works properly & I feel a nice, ease with what I am playing. (I am not a 'pianist' by any stretch of the imagination.)
My hands just want, itch for piano keys. Or it is just to relieve nervous tension, which I feel in how I get fidgety.