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Keynote
the built-in Mac app for creating presentations that can also be used for quick prototyping (see how Apple designers use it in the WWDC 2014 session "[Prototyping: Fake It Till You Make It](https://de
Design
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the built-in Mac app for creating presentations that can also be used for quick prototyping (see how Apple designers use it in the WWDC 2014 session "[Prototyping: Fake It Till You Make It](https://developer.apple.com/videos/play/wwdc2014/223/)" to verify design concepts).  
Alternatives to Keynote
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