June 2007-September 2007
This logo was used during iPhone OS 1.0 to 1.1, from June 2007 to September 2007.
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.
This logo was used during iPhone OS 3, from June 2009 to May 2010. The buttons became more square.
This logo was used during iOS 4 to iOS 6, from June 2010 to August 2013. The buttons are now bigger,
iOS 7 had all icons completely redesigned. The buttons now have a different color and flat design. Used until iOS 11.
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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