I found one that has a score sheet to measure inches on the B and C scale, one on archery tips (not that I currently bow hunt....maybe next season)
While I agree that carting a load of technology into the field defeats the purpose in many aspects, when you're NOT out hunting, its nice to have a hunting related diversion on the phone to play with.
Here again, I do take my phone with me so I can snap pics of anything I put down and call my wife "honey! meet me at the ranch gate in an hour, you've got to see this!" (true story, heh)
I hunt on about 825 acres of which I know backwards and forwards so getting above mildly turned around is not likely to happen. If I'm looking at my phone and walking, I may well step off a 150 ft bluff to my doom.