Best pitch tracker on iOS

I teach our church choir and weve started training them in our new digital world. Ive loaded up my wish list with every pitch software on iOS and "pitch graph" did the best and was the easiest to use. (Cant beat the price) I wish theyd allow an upgrade to store each file and sent via email. Also, silence should be allowed and tracking should still continue. Just my 2 cents. With upgrades I would pay an easy $5

Unshakendude about Pitch Graph