Research firm Sensor Tower shares an analysis: As the minimum storage capacity of iPhone continues to increase -- it sits at 32 GB today on the iPhone 7, double the the iPhone 5S's 16 GB circa 2013 -- it's not surprising that the size of apps themselves is getting larger. In fact, Apple raised the app size cap from 2 GB to 4 GB in early 2015. What's surprising is how much faster they're increasing in size compared to device storage itself. According to Sensor Tower's analysis of App Intelligence, the total space required by the top 10 most installed U.S. iPhone apps has grown from 164 MB in May 2013 to about 1.8 GB last month, an 11x or approximately 1,000 percent increase in just four years. [...] Of the top 10 most popular U.S. iPhone apps, the minimum growth we saw in app size since May 2013 was 6x for both Spotify and Facebook's Messenger. As the chart above shows, other apps, especially Snapchat, have grown considerably more. In fact, Snapchat is more than 50 times larger than it was four years ago, clocking in at 203 MB versus just 4 MB at the start of the period we looked at. It's not the largest app among the top 10, however. That distinction goes to Facebook, which, at 388 MB, is 12 times larger than it was in May 2013 when it occupied 32 MB. It grew by about 100 MB in one update during September of last year.