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Icon Sizes (https://github.com/phonegap/phonegap/wiki/App-Icon-Sizes)

Android

• 192px (xxxhdpi)
• 144px (xxhdpi)
• 96px (xhdpi)
• 72px (hdpi)
• 48px (mdpi)
• 36px (ldpi)
• 512x512 pixel - only used in Android Market; resized to various sizes

iOs see (http://mrgan.tumblr.com/post/708404794/ios-app-icon-sizes)

• 57 px, iPhone
• 72 px, iPad
• 114 px, iPhone 4 Retina Display
• 144 px, iPad 3 Retina Display
• 1024 px, iTunes – Used in iTunes and in the App Store sized down to 175px
• 29 px, iPhone Settings/Spotlight, iPad Settings – used in these table views. Minor, but still important!
• 48 px, iPad Spotlight
• 58 px, iPhone 4 Settings/Spotlight
• 64 px document icon
• 320 px document icon