iOS 11

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<div style="font: bold 2em/1.2 -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, sans-serif; color: var(--wiki-color);">iOS 11</div>
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! class="ios-lab" | Developer
| class="ios-val" | [[Apple]]
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! class="ios-lab" | Announced
| class="ios-val" | June 5, 2017 (WWDC)
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! class="ios-lab" | Initial release
| class="ios-val" | September 19, 2017
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! class="ios-lab" | Final release
| class="ios-val" | 11.4.1 (July 9, 2018)
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! class="ios-lab" | Launch devices
| class="ios-val" | [[iPhone 8]] · [[iPhone 8 Plus]] · [[iPhone X]]
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! class="ios-lab" | Preceded by
| class="ios-val" | [[iOS 10]]
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! class="ios-lab" | Succeeded by
| class="ios-val" | [[iOS 12]]
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{{iOS Version Navbox}}

iOS 11 is the eleventh major release of [[iOS]], released on September 19, 2017, with the [[iPhone 8]] generation and — six weeks later — the [[iPhone X]], whose gesture interface, Face ID, and notch-aware layouts it carried. It was two releases in one: a transformative iPad update (a Mac-style Dock, a true app switcher, drag and drop, and the Files app finally exposing a filesystem) and, on iPhone, the platform's rockiest quality cycle — a cadence of bugs, battery complaints, and emergency point releases that pushed Apple into the stability-focused [[iOS 12]].

It also closed the 32-bit era: apps never updated for 64-bit simply stopped launching, cutting off a museum's worth of early App Store history — and it hosted the battery-throttling controversy, whose December 2017 disclosure produced Apple's apology, $29 battery replacements, and the Battery Health controls delivered in 11.3.

= Features =

ARKit — instant, calibration-free augmented reality for hundreds of millions of devices, the largest AR platform launch ever — headlined for developers. Users got a customizable, unified Control Center; screen recording; Do Not Disturb While Driving; a one-handed keyboard; person-to-person Apple Pay (11.2); a redesigned App Store with editorial Today content; and HEIF/HEVC media formats halving photo and video sizes. The iPad's Dock, Split View via drag, Files, and Apple Pencil integrations effectively previewed iPadOS.

= Supported devices =

[[iPhone X]], [[iPhone 8]]/[[iPhone 8 Plus|8 Plus]] back through [[iPhone 5s]], iPad Air/mini 2 and later, and the sixth-generation iPod touch — dropping the 32-bit [[iPhone 5]] and [[iPhone 5c]].

= Legacy =

ARKit seeded the spatial-computing lineage that surfaced in visionOS; the Files app and iPad Dock became iPadOS's foundation; and the X's gesture grammar, shipped inside this release, became the platform's permanent interaction model. But iOS 11 is equally remembered as the quality low-water mark that forced a course correction — the reason "this year focuses on performance and reliability" became a recurring WWDC sentence, starting with its successor.