This document summarizes key insights from Distimo's analysis of mobile app stores. It finds that (1) in-app purchases have become a major driver of revenue, generating over 75% of sales for top apps (2) the mobile app market is shifting rapidly with growth in countries like China and fragmentation across devices (3) developers need to look beyond one-time fees and analyze performance across stores to stay competitive. The document encourages app makers to use Distimo's free and paid tools to benchmark their apps.