App Annie raised $6 million in a second round of funding led by Greycroft Partners with participation from existing backers .ventures, Infinity Venture Partners and a few other investors. The firm offers a set of solutions that can be labeled as Google Analytics for mobile.

App Annie’s tools enable app publishers, platform owners and pretty much everyone else with a stake in the mobile application space to gain better insight into metrics such as downloads, in-app transactions and revenue. It aggregates data from the App Store, the Mac App Store, and is used by 80 percent of the 100 highest earning iOS publishers.

For larger customers that are willing to pay a premium, App Annie is also offering App Annie Intelligence, a service that takes the data that’s collected from the different marketplaces and makes use of them. It is used by the likes of Microsoft, Nokia and EA to gauge market share and identify revenue opportunities across geographical areas,  as well as other insight relevant to their product’s performance.

“App stores are driving today’s digital economy,” said Dana Settle, partner, Greycroft Partners. “App Annie is an invaluable tool for any business that needs access to the highest quality app store analytics and market data. As the marketplace for mobile apps and digital goods continues to explode, App Annie is incredibly well positioned to become the de facto analytics and intelligence standard across all platforms.”

App Annie is not the only company that is putting mobile data into use. WiFi user engagement firm JiWire released its latest audience insights report not too long ago, which shared some information about the leading trends among North American wireless users. The main highlights: WiFi is more popular than ever, and so is Instagram.