Logos by version
iPhone OS
iPhone OS 1.0 (2007–2010)
iPhone OS 2.0 (2008–2011)
iPhone OS 3.0 (2009–2012)
iPhone OS 3.1 (2009–2012)
iPhone OS 3.2 for iPad (2010–2012)
iOS
iOS 4 & 4.1 (2010–2013)
In 2010, Apple renamed iPhone OS to iOS as the iPod Touch and iPad also supported the software. This first started when iOS 4 was released.
iOS 4.2 (2010–2013)
iOS 4.3 (2011–2013)
iOS 5 (2011–2014)
iOS 5.1 (2012–2014)
iOS 6 (2012–2015)
Before iOS 7 came out, iOS 6 was the last version that uses Steve Jobs's theme after he died. Support ended in 2015.
iOS 7 (2013–2016)
In September 2013, Apple released iOS 7 with an all new design, and new features such as the control center, revamped app switcher, and more to make iOS more enjoyable and user-friendly. Support ended in September 2016.
iOS 7.1 (2014–2016)
iOS 8 (2014–present)
iOS 8.1 (2014–present)
iOS 9 (2015–present)
iOS 9.1 (2015–present)
iOS 9.2 (2015–present)
iOS 9.3 (2016–present)
iOS 10 (2016–present)
iOS 11 (2017–present)
Horizontal logos
iPhone OS 3.x (2009-2012)
iOS 4 (2010-2013)
iOS 5 (2011-2014)
iOS 6 (2012-2015)
iOS 7 (2013-2016)
iOS 8 (2014-present)
iOS 9 (2015-present)
iOS 10 (2016 - present)