iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware. It is the operating system that powers many of the company's mobile devices, including the iPhone and iPod Touch...

Download current and previous versions of Apple's iOS, iPadOS, watchOS, tvOS and audioOS firmware and receive notifications when new firmwares are released.

iPhone OS 1, retroactively referred to as iOS 1, was the first major version of the iOS mobile operating system to be publicly released by Apple Inc. It was developed from Mac OS X and debuted with the first iPhone on June 29, 2007. It was later updated to support the first iPod touch.

iOS, formerly known as iPhone OS (and just Mac OS X), is the operating system for the Apple TV, iPad, iPad mini, iPhone, iPod touch. iOS has four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer.