ComScore is one of the larger providers of these statistics similar to Nielsen ratings they provide a library you setup in your app.<p>see # 18: <a href="https:&#x2F;&#x2F;medium.com&#x2F;ios-os-x-development&#x2F;libraries-used-in-the-top-100-ios-apps-5b845ad927b7#.60hwtj4wo" rel="nofollow">https:&#x2F;&#x2F;medium.com&#x2F;ios-os-x-development&#x2F;libraries-used-in-th...</a>