Currently, iTunes lists the top 10 in-app purchases in the app description, which makes it easy to gauge what will happen when you use the app. The Play Store

Currently, iTunes lists the top 10 in-app purchases in the app description, which makes it easy to gauge what will happen when you use the app. The Play Store only recently added "Offers in-app purchases" as small print next to the device compatibility info. Not sure if Android users will embrace any form of hybrid pricing that doesn't say "Free".