iOS app icon size

Table 41-1Size (in pixels) of custom icons and images

Asset	IPhone 6 Plus (@3x)	iphone 6 and iphone 5 (@2x)	IPhone 4s (@2x)	ipad and ipad mini (@2x)	ipad 2 and ipad mini (@1x)
APP icon (required for all apps)	180 x	x 120	x 120	X 152	x 76
App icon for the app Store (required for all apps)	1024x768 x 1024	1024x768 x 1024	1024x768 x 1024	1024x768 x 1024	1024x768 x 1024
Launch file or image (required for all apps)	Use a launch file (see launch Images)	For IPhone 6, use a launch file (see launch Images) For IPhone 5, 640 x 1136	640 x 960	1536 x 2048 (Portrait) 2048 x 1536 (Landscape)	768 x 1024x768 (Portrait) 1024x768 x 768 (Landscape)
Spotlight Search results icon (recommended)	x 120	X 80	X 80	X 80	X 40
Settings icon (recommended)	x 87	58 X	58 X	58 X	X 29
Toolbar and navigation bar icon (optional)	About X 66	About 44 x	About 44 x	About 44 x	About X 22
Tab bar icon (optional)	About X (maximum:144 x 96)	About X (maximum:96 x 64)	About X (maximum:96 x 64)	About X (maximum:96 x 64)	About X (maximum:48 x 32)
Default Newsstand cover icon for the App Store (required for Newsstand apps)	At least 1024x768 pixels on the longest edge	At least 1024x768 pixels on the longest edge	At least 1024x768 pixels on the longest edge	At least 1024x768 pixels on the longest edge	At least pixels on the longest edge
Web Clip icon (recommended for Web apps and websites)	180 x	x 120	x 120	X 152	x 76

Reference: https://developer.apple.com/library/prerelease/ios/documentation/UserExperience/Conceptual/MobileHIG/ Iconmatrix.html#//apple_ref/doc/uid/tp40006556-ch27-sw1

iOS app icon size