The document provides a summary of key trends in the mobile app market in 2012. It finds that Google Play showed strong revenue growth over the last 4 months of 2012, while the Apple App Store grew more modestly. However, the Apple App Store still generated significantly higher total daily revenues. Some apps like Draw Something and Line Pop achieved millions of users within days. The proportion of revenue from in-app purchases on the Apple App Store increased from 53% to 69% over 2012. The United States remained the largest market by revenue, followed by Japan, the UK, and Australia.