IOS 9
| A version of the iOS operating system | |
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| Developer | Apple Inc. |
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| Source model | Closed, with open source components |
| Initial release | September 16, 2015 |
| Latest release | 9.3.5 (13G36) / August 25, 2016 |
| Platforms | |
| Kernel type | Hybrid (XNU) |
| License | Proprietary EULA except for open-source components |
| Preceded by | iOS 8 |
| Succeeded by | iOS 10 |
| Official website | iOS 9 at the Wayback Machine (archived September 6, 2016) |
| Support status | |
| Third-party application support only | |
iOS 9 is the ninth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 8. It was announced at the company's Worldwide Developers Conference on June 8, 2015, and was released on September 16, 2015. It was succeeded by iOS 10 on September 13, 2016.
iOS 9 incorporated many feature updates to built-in apps. Most notably, Notes received the ability to draw sketches with different tools, image insertion, prominent visual appearance for website links and map locations, and advanced list formatting; an all-new Apple News app aggregates articles from different sources; and Apple Maps received mass transit support, although in a limited number of locations at launch. Major new system updates include proactivity, where Siri and advanced search are combined to make the operating system more contextually aware of information (such as time and location), and can provide the user with information ahead of time. For searching, the proactive intelligence can display instant results in a widget-like format, including weather, sports, news, and more. iOS 9 also added multiple forms of multitasking to the iPad. In iOS 9.3, Apple added a Night Shift mode that changes the color of the device's display to a warmer, less "blue light" shade, to prevent any potential negative screen effect on users' circadian rhythms.
Additionally, iOS 9 brought new user experience functions, including Quick Actions, and Peek and Pop, based on the touch-sensitive display technology in the iPhone 6S. Quick Actions are shortcuts on home screen app icons. Users can preview ("Peek") at content without moving away from the current screen before they enter ("Pop") the previewed content into full view.
On September 21, 2015, Apple announced that iOS 9 had been installed on more than 50% of "active" iOS devices, as measured by the App Store. According to Apple, this was the fastest adoption rate ever for a new operating system.
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