The mobile app boom has ended (AAPL, GOOG, GOOGL)

BII

The mobile app boom in the U.S. has screeched to a halt.

App download growth in the U.S. may have peaked as the pool of new app users shrinks, according to new data from app marketing firm SensorTower and Nomura shared with BI Intelligence, Business Insider's premium research service.

On average, the volume of downloads from the top 15 app publishers across both Apple iOS and Google Android devices fell 20% year-over-year in May 2016.

The global app download volume of the top 15 app publishers continues to climb slightly, but at a slower pace than last year. In May 2016, average global download rates from these publishers grew just 3% YoY.

This growth deceleration is occurring primarily because the largest apps have showed maturation, even as engagement rates remain steady. Facebook now has 1.6 billion monthly active users, which makes it increasingly difficult to find new users to attract. Yet Facebook still managed 36 million downloads in May 2016 despite a 15% YoY decline.

There are some noteworthy exceptions to this trend, however, Uber and Snapchat both registered YoY growth greater than 100%. Snapchat, in particular, has demonstrated tremendous growth thanks in large part to its young user base. And this growth occurs as other social media downloads have declined. So it is difficult, but some app publishers can still enjoy significant app download growth.

For more, see the detailed report on mobile app installs from BI Intelligence. Click here to learn more about how you can gain risk-free access today.