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The iOS 8 installation rate continues to tick upward ever so slowly. Upgrades have slowed since late last year, with 69 percent of compatible devices currently running iOS 8.0 or later. Two weeks ago the number stood at 68 percent, which points towards a plateau in updates to iOS 8 amongst iPhone, iPad and iPod touch users.

Apple's App Store Distribution page illustrates current iOS usage in a pie graph, with iOS 7 at 28 percent and previous versions comprising just 3 percent of the total. All of the statistics were collected as of January 19th, 2015.

Holdouts with iOS 7 installed on their iOS 8 compatible devices now account for just 33 percent of total users. Apple metrics collected on the App Store point to a slowdown in iOS 8 installations, which initially soared in the early days after release. Still, the number of iOS 8 adpotions continues to tick upward.

The total number of iOS compatible devices running iOS 8 currently stands at 63 percent. This leaves only four percent of newer hardware running iOS 6 and earlier firmware. The jump from iOS 6 to iOS 7 was a more dramatic redesign, with users installing the update at a much faster clip.