The App I use is called "Best Bowling Free". It's a free App you can find in the App Store, You can use it on a Iphone or Ipad (I use it on Ipad).
There is a paid version also called "Best Bowling (v3.0)" for $5. which does a little bit more stuff.
Here is the Developers website:
http://yama-tatsu.jp/iphone-en/bestbowling/index.html
Hope this helps.
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