Proof page 1 : https://play.google.com/store/search?q=bitcoin&c=apps

App is fairly popular.

1200 USD or 14 BTC (I hate to say it but I prefer USD as I have bills that don't accept BTC).

Webapp : http://www.ounce.me Google Play : https://play.google.com/store/apps/details?id=com.btc.ounce.me