When Apple announced on Monday that it had sold a record 9 million iPhones during the launch weekend for the new iPhone 5s and 5c, it also said that around 200 million iOS devices have been updated to iOS 7 since the update was released less than a week before on Sept.18. Apple said it was the “fastest software upgrade in history”, but didn’t compare iOS 7 adoption to previous releases. Mobile app marketing platform Fiksu has been tracking millions of iPhones hourly since the launch of iOS 7 and it’s latest numbers show iOS 7 adoption is much higher than previous releases. Fiksu has iOS 7 usage at almost 58 percent just 7 days after release, compared to under 47 percent iOS 6 had in the same timeframe and 27.2 percent of devices for iOS 5. That almost 60% share for iOS 7 is up from the 30 percent estimated by Mixpanel less than 24 hours after the release of iOS 7.