OS X App: Icon
It automatically creates all the app icons necessary to use for iOS 6, iOS 7, and Mac OS X from a single image (1024 x 1024 pixels or larger)!
Generate icons with rounded corners in addition to square icons — whichever way you like.
Note: Use the icons with rounded corners only to promote your iOS app, but not directly in the app’s resource bundle. The operating system will automatically round the corners to display the app icon. You should also upload the square icon for use on the App Store.
You can select the folder to save the resulting icons and use them directly in Xcode and iTunes Connect.
The following files are generated with this app.
For iOS:
iTunesArtwork@2x.png
iTunesArtwork.png
Icon-60@2x.png
Icon-76.png
Icon-76@2x.png
Icon-Small-40.png
Icon-Small-40@2x.png
Icon-Small.png
Icon-Small@2x.png
Icon.png
Icon@2x.png
Icon-72.png
Icon-72@2x.png
Icon-Small-50.png
Icon-Small-50@2x.png
For OS X:
icon_512x512@2x.png
icon_512x512.png
icon_256x256@2x.png
icon_256x256.png
icon_128x128@2x.png
icon_128x128.png
icon_32x32@2x.png
icon_32x32.png
icon_16x16@2x.png
icon_16x16.png