I've gifted my D7100, alongside a 35mm DX lens to my girlfriend.
For a few weeks I was debating on going FF, with something like a D750 or maybe even a D810, but finally decided against it.
Found a fantastic deal on a D7200 in pretty much mint condition, as the guy using it really took good care of camera. Even got a new original Nikon battery in the whole package.
The first lens that I got for it is another 35mm DX, as I loved using that lens on the D7100. It's probably one of the best DX lenses you can get (at least from all the lenses I've used).
Seems it’s dead and abandoned. I really liked the app too.