Make an app yourself then if you care about it that much.
Go pay your royalty fees to Apple, buy the necessary hardware, code the thing yourself, and put it in their app store.
Likely it doesn't exist because no one cares enough to actually spend the time and money to make it exist. I know it's not something I care about and would never use.
The thing with mobile development is you're paying royalties for the privilege of making things that work on whichever phone you choose. Ditto if you want to do the same for the others (Google/Microsoft). You play by their rules and those rules are much more restrictive than those for PC software.
I keep hoping this smartphone app fad will die out.