Apple now claims on its developer website that 80 percent of devices are using iOS 7, a statistic measured through the “App Store during a 7-day period ending January 26, 2014.” In early December, Apple released numbers in the same quiet manner, noting that 74 percent of devices were using iOS 7 in a seven-day period ending Dec. 1. Apple now claims 17 percent of devices are using iOS 6, with 3 percent using an older version of iOS. Intended for developers, the metric obviously doesn’t capture devices that aren’t actively using the App Store, so it’s unclear how generalizable the numbers are to the entire iOS-using population.