At the 24-hour milestone, iOS 9 accounted for 12.3% of all iOS editions detected by Mixpanel, whose metrics platform is widely used by mobile app developers to track usage and user engagement. That was lower than the 15.6% accumulated by iOS 8 last year at the same post-release point, and much lower than the 29.9% that iOS 7 collected in 2013 within 24 hours. However, at the 44-hour mark, iOS 9’s adoption surpassed that of iOS 8, reaching 20.1% compared to the 19.4% of its forerunner.
The better performance of iOS 9 later in its cycle may have been due to troubles some users encountered in grabbing the upgrade immediately after it was released by Apple. For at least the first hour of availability on Wednesday morning, users — including some Computerworld staffers — were unable to access the download.
iOS 9’s — and iOS 8’s before it — failure to match the rapid adoption tempo of iOS 7 may be simply because of the intense interest in iOS 7, which was the first major visual overhaul of the iPhone’s operating system since the smartphone’s 2007 debut. The larger numbers of iOS devices in use compared to 2013 could also be contributing to the slower adoption: As a user base increases in size, it’s inherently more difficult to reach the same percentage of change. Microsoft’s Windows suffers from a similar problem when compared to the much smaller user base of Apple’s OS X, for example.
While iOS 8 demanded as much as 5GB of open storage space to install the upgrade after downloading it over the air — forcing those with small storage-sized devices like the 16GB iPhone to turn to the awkward iTunes-based approach — Apple has promised that iOS 9 requires less than 2GB of free space. Read more…