Apple's iOS 9 operating system is now in use on 75 percent of iPhones and iPads combined.
Data on Apple's development page dated 11 January shows that uptake has now reached three-quarters of devices.
This leaves just 19 percent on iOS 8 and seven percent on older versions of iOS, probably because their devices cannot move to iOS 8 or above.
The figure comes around four months after iOS 9 was officially launched on 16 September 2015, and underlines the marked difference between iOS and Android, which suffers from huge fragmentation problems.
This poses security problems for Android devices, as fixes are often rolled out to end users at markedly different times, and makes it hard for developers to keep track of the various builds they have to create to make apps compatible.
The figures come in the same week that Apple released the beta version of iOS 9.3 to developers, offering several major changes including Night Shift and further improvements to the CarPlay service.
Perhaps the most notable new feature is Night Shift, which automatically adjusts the light on iPhone and iPad screens based on the time of day to reduce the negative effects of screen glare on human eyes.
“Night Shift uses your iOS device’s clock and geolocation to determine when it’s sunset in your location. Then it automatically shifts the colours in your display to the warmer end of the spectrum, making it easier on your eyes. In the morning, it returns the display to its regular settings,” Apple explained.
Apple said it is introducing this feature in response to studies showing that the glare from digital screens can affect the brain and make it harder to fall asleep.
Another notable new update is the ability to use the Touch ID fingerprint scanner to protect Notes, ensuring that any sensitive information is kept secure.
“Now you can secure the notes that contain your most personal data, such as financial details, medical info, or website log-ins, with a password or fingerprint," Apple said.
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