Apple formally announced iOS 9 last September, and began rolling it out a week later to several generations of its iPhones and iPads, along with the fifth-gen iPod touch. Within just three days, the update had made its way to a staggering 50% of iOS devices, making it the operating system's fastest rollout ever.
![](https://cdn.neowin.com/news/images/uploaded/2016/01/ios-9-75-percent.jpg)
At the time, Apple's Phil Schiller said that it was "on pace to be downloaded by more users than any other software release in Apple's history" - and it's clearly continuing to make good progress on that front.
As TNW spotted, an update to Apple's Developer site reveals that iOS 9 is now installed on around 75% of devices, just four months after its launch. To put that figure into context, it took a full year for iOS 8 to reach 87% of devices.
iOS 8 is still installed on 19% of devices, with 7% using earlier versions of the OS.
In comparison, Android 6.0 Marshmallow - the latest version of Google's OS, which was officially announced three weeks after iOS 9, and began rolling out in early October - is currently installed on just 0.7% of active devices.
Source: Apple Developer via TNW
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