[IOS] Mining profitability calculator App

This app including a real-time BTC market ticker inspired by bitcoinity.org and clarkmoody's website, and a mining profitability calculator that recently updated, now is available in AppStore. I would like to take your advices to improve it, any thoughts is welcome.

AppStore link : https://itunes.apple.com/us/app/bitcoin-data/id676937121?ls=1&mt=8

You can use the promotional code below to download and test it, Thank you!

PRJJ7K67HWYN
R64L6LX3R4YX
4M3TWERA66KL
MP3KN74AE43M
KRM3NNTWYWW4
39WTM49AAAME
MTR7KKWXJWPL
PPXXLR9NNMF4
WWRTLTE6WX9K
4JJ44376PFLM

http://a5.mzstatic.com/us/r1000/002/Purple6/v4/ab/45/3d/ab453da0-dcd7-8ffd-2465-2575d02ce8d5/mzl.tqekeney.175x175-75.jpg

http://a3.mzstatic.com/us/r30/Purple/v4/e8/db/9f/e8db9f15-bec5-7dba-3bfa-9f4be03e56be/screen568x568.jpeg