June 2007–September 2007
This logo was used during iPhone OS 1.0 to 1.1, from June 2007 to September 2007.
2007–2009
This logo was used during iPhone OS 1.1, from September 2007 to May 2009. It has a different color scheme. The ÷ sign was replaced with a = sign.
2009–2010
This logo was used during iPhone OS 3, from June 2009 to May 2010. The buttons became more square.
2010–2013
This logo was used during iOS 4 to iOS 6, from June 2010 to August 2013. The buttons are now bigger,
2013–2017
iOS 7 had all icons completely redesigned. The buttons now have a different color and flat design. Used until iOS 11.
2017–present
Icon first used in iOS 11 Beta. Instead of just being four calculator buttons, the app icon is now an actual calculator.
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