App Annie has launched Usage Intelligence, a platform which provides data on how apps are being used, including the number of active users, time spent, usage frequency and retention.

“We see so much pent-up demand from everyone in the mobile industry for this type of information,” said Bertrand Schmitt, co-founder and CEO of App Annie. “Usage data is of paramount importance to mobile app publishers and investors, particularly when you are talking about analysing apps that monetise outside of the store.”

Usage Intelligence is currently in beta, available to selected existing customers, with a full release planned for Q2 2015.

App Annie has also announced the closure of a $55m Series D funding round, led by Institutional Venture Partners (IVP), with participation from existing investors Sequoia Capital, Greycroft Partners and IDG Capital Partners.

App Annie says the funding will be used to invest in product development, accelerate international expansion and fund potential M&A activity.