Forstall was also responsible for creating a software development kit for programmers to build iPhone apps, as well as an App Store within iTunes. The decision enabled the success of the iPhone as a platform for third-party developers: using a well-known desktop operating system as its basis allowed the many third-party Mac developers to write software for the iPhone with minimal retraining. Jobs favored the former approach but pitted the Macintosh and iPod teams, led by Scott Forstall and Tony Fadell, respectively, against each other in an internal competition, with Forstall winning by creating the iPhone OS.
In 2005, when Steve Jobs began planning the iPhone, he had a choice to either "shrink the Mac, which would be an epic feat of engineering, or enlarge the iPod".
Third iOS logotype (2017–present), using San Francisco Semibold font The current stable version, iOS 15, was released to the public on September 20, 2021. Major versions of iOS are released annually. These mobile apps have collectively been downloaded more than 130 billion times. Unveiled in 2007 for the first-generation iPhone, iOS has since been extended to support other Apple devices such as the iPod Touch (September 2007) and the iPad (introduced: January 2010 availability: April 2010.) As of March 2018, Apple's App Store contains more than 2.1 million iOS applications, 1 million of which are native for iPads. It is proprietary software, although some parts of it are open source under the Apple Public Source License and other licenses. It is the basis for three other operating systems made by Apple: iPadOS, tvOS, and watchOS. It is the world's second-most widely installed mobile operating system, after Android. It is the operating system that powers many of the company's mobile devices, including the iPhone and iPod Touch the term also included the versions running on iPads until the name iPadOS was introduced with version 13 in 2019. IOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. Proprietary software except for open-source components
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