We use chart boost for promoting our app, we can see how many views each one has so that is very helpful when planning promotions or campaigns! It's not great at all because it takes time before I get any money back from my advertising but overall its been good enought until now where they have stopped supporting their service completely after 7 years of being used by us!! Very bad decision if your looking into this as an option then look elsewhere otherwise there are more options out hereβ¦