The mobile sales analytics tool that is Mopapp has come out of private beta today and directly into free, public beta. The cross-platform/cross-store tool allows for developers to track and analyze sales for their apps across a variety of outlets. Unlike some of their competitors, Mopapp works with not only with apps in the Android Market and App Store, but also through RIM App World, Mobihand (OnlyAndroid/AndroidGuys), and more!

The API lets its users compare sales by platform, app/game, country, and store. There are already native clients available for Android and iPhone, each in their respective stores.  The beta is public and free to anyone interested. At the end of the beta period, users will have the option to subscribe to the Pro plan or downgrade to the Community Free plan.