Use APKit for In-app purchase easier, set observer then click product, wait ... Wow, completed!
About LightnessUI, i want to say, eazier for developer, Custom
UIView and JSON 2 View.
MSWebApp: More and more html pages and frameworks used in app, like: react-native, weex, phone-gap and more. Learning that will cost a lot of time. more times, we only need a little html pages.
MSWebApp is used for dynamic manage the modules.