Google during its I/O keynote hit a symbolic milestone: it now has 600,000 apps in the Google Play Store. As well, the store is clearly hitting a brisk pace in adoption, with 1.5 billion downloads every month and 20 billion since Android began. Free apps are available in 190 countries, with paid apps in 132. The app and download counts stack up fairly well to Apple's own claims, although not universally: it's just short of the App Store's 650,000 apps, but Apple can still point to 30 billion total downloads. Google also hasn't said how many apps are explicitly tablet-friendly versus 225,000 iPad-oriented apps. Either way, Google can say that it has largely erased the app quantity deficit, and that's no mean feat.