Apple added in-app purchases feature to allow developers sell features inside their games and apps. Unlike apps, users cannot try out the paid features before making decision to buy them. LocaliApStore for iOS 11/11.2 can solve this issue.
If you love anime, you would be familiar with Crunchyroll. It is one of the best website that allow you watch anime in HD quality. However, if you use the free version, you have limitations. Crunchyroll offers premium version too that offers you to download the animes in HD quality and has better speed.