Eighty-eight percent of iPhone, iPad and iPod touch devices are currently using iOS 9, a one-point increase over the iOS 9 adoption rate of 87 percent which was recorded about three weeks ago.
During the same timeframe, iOS 8 has gone from ten percent of devices in August 15 to nine percent of devices. 'Earlier' versions continue to power three percent of older devices out there, as per newest stats on the App Store dashboard for developers.