You can choose whether to apply the effects "rounded corners" or "reflected shine" to the icon.
The name of all the icons (iPhone, iPad) and the iconset (Mac) is changeable.
Choose to create the iconset folder or only the .icns file.
The image is resized (1024 px at 72 dpi) if it's too large/small.
Save your template on iCloud.

iPhone application icons:

1024x1024 px (iTunesArtwork@2x);
512x512 px (iTunesArtwork);
114x114 px (AppIcon@2x);
57x57 px (AppIcon);
58x58 px (Settings@2x);
29x29 px (Settings).

iPad application icons:

1024x1024 px (iTunesArtwork@2x);
512x512 px (iTunesArtwork);
144x144 px (AppIcon@2x);
72x72 px (AppIcon);
100x100 px (Search@2x);
50x50 px (Search);
58x58 px (Settings@2x);
29x29 px (Settings).

Mac application icons:

1024x1024 px ([email protected]);
512x512 px (icon_512x512.png);
512x512 px ([email protected]);
256x256 px (icon_256x256.png);
256x256 px ([email protected]);
128x128 px (icon_128x128.png);
64x64 px ([email protected]);
32x32 px (icon_32x32.png);
32x32 px ([email protected]);
16x16 px (icon_16x16.png).

Requirements: OS X 10.8 or later, 64-bit processor[code][/code]