http://ivomynttinen.com/blog/the-ios-7-design-cheat-sheet/

The iOS Design Cheat Sheet 7

Everything you need to know when it comes to iOS 7.
With the release of iOS 7, app designers and developers will need to adjust 
their visual language to match the new "flat" design of iOS. In addition to the 
grid system, the dimensions of icons and commonly used elements, typography and 
iconography has been updated by Apple in many ways. That's why the old iOS 
Design Cheat Sheet that I published last year with the release of the iPad mini 
needs an update now. I decided to shift away from pure value-based tables about 
sizes of design elements towards a simple guide that should help to get you 
started with iOS 7 app design. As always I will update this guide over time, 
and if you think there is something important missing here, just let me know.

Since iOS 7 is not supported on older models of the iPhone and iPod (only 4+), 
this guide will only cover the supported devices. If you are looking for 
information related to these devices, you should take a look at the older iOS 
Design Cheat Sheet v2.

Resolutions & Display Specifications

Resolutions

Devices Portrait        Landscape
iPhone 5 iPhone 5, 5S, 5C       640x1136 px     1136x640 px
iPhone 4/4S     640x960 px      960x640 px
iPhone & iPod Touch 1st, 2nd and 3rd Generation                                 
                                        320x480 px      480x320 px
Retina iPad iPad 3, iPad 4, iPad Air    1536x2048 px    2048x1536 px
iPad Mini       768x1024 px     1024x768 px
iPad Mini Retina        1536x2048 px    2048x1536 px
iPad 1st and 2nd Generation     768x1024 px     1024x768 px
Displays

Devices PPI     Color Mode      Color Temperature
iPhone 5 iPhone 5, 5S, 5C       326     8bit RGB        Warm
iPhone 4/4S     326     8bit RGB        Cool
iPhone & iPod Touch 1st, 2nd and 3rd Generation                                 
                                        163     8bit RGB        Warm
Retina iPad iPad 3, iPad 4, iPad Air    264     8bit RGB        Warm
iPad Mini       163     8bit RGB        Warm
iPad Mini Retina        326     8bit RGB        Warm
iPad 1st and 2nd Generation     132     8bit RGB        Warm
App Icons

One of the biggest changes in iOS 7 is the new dimensions and the visual 
language used for app icons. Apple introduced a grid system, increased the 
general size of icons on your home screen and also masked icons with a 
different shape.

Dimensions

Device  App Icon        AppStore Icon   Spotlight Icon  Settings Icon
iPhone 5 iPhone 5, 5S, 5C       120x120 px      1024x1024 px    80x80 px        
58x58 px
iPhone 4/4S     120x120 px      1024x1024 px    80x80 px        58x58 px
Retina iPad iPad 3, 4, Air, Mini Retina                                         
                                152x152 px      1024x1024 px    80x80 px        
58x58 px
iPad Mini       76x76 px        512x512 px      40x40 px        29x29 px
iPad 1st and 2nd Generation     76x76 px        512x512 px      40x40 px        
29x29 px

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