Apple's latest mobile operating system iOS 8 has now been available for seven and a half weeks and the company have posted the most recent user adoption rate percentages on their App Store support page for developers.
The figures show that 56% of iOS devices are running a version of iOS 8, 40% are still on iOS 7 and just 5% run operating systems older than that.
This adoption rate isn't as impressive as those we've seen in past years; you only have to compare it with last year to see just how much iOS 8 has struggled. One week after iOS 7 was launched last year it was already installed on 60% of iOS devices, and around his time last year it was running on 76% of devices.
So why is iOS 8 uptake struggling so much?
Arguably the biggest reason behind this was the fact that to install the update on any iOS device you needed to have at least 5GB of free memory. Now considering the Apple's biggest sellers are the baseline 16GB versions of the iPad, iPhone and iPod this was a significant problem for most users.
Unless you're someone who really likes to have all your devices running the latest software, for a large proportion of Apple users it would be far too much hassle to remove apps, photos, videos or songs and then reinstall them, just to get updates that are rather minor in comparison to previous versions of the OS.
Why iOS 8 required 5GB of free memory to install is unclear. The actual operating system takes up nowhere near that amount of memory when actually installed and running on the device.
A second factor in the struggle is that many users aren't so eager to upgrade straight away and hold off to see what the initial reaction is like. The first version of iOS 8 was riddled with bugs, particularly with the HealthKit app, so you can expect the reaction wasn't that great.
The next update, iOS 8.0.1, fixed HealthKit and various other bugs but introduced two more much bigger ones, it disabled TouchID and killed cellular signal for most users.
Updates since have fixed these issues, and the latest version iOS 8.1 is the most stable yet. However with the rocky launch that iOS 8 has had it's not really a surprise to see its adoption figures stuttering.
It's needless to say that despite these figures looking disappointing compared to years gone by, when compared to the 30% of Android devices running 4.4 KitKat, it does provide a slightly better outlook.