http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/mobilehig/IconsImages/IconsImages.html
| Description | Size for iPhone 5 and iPod touch (5th generation) | Size for high-resolution iPhone and iPod touch | Size for iPhone and iPod touch | Size for high-resolution iPad | Size for iPad | Guidelines |
|---|---|---|---|---|---|---|
| App icon (required for all apps) | 114 x 114 | 114 x 114 | 57 x 57 | 144 x 144 | 72 x 72 | “App Icons” |
| App icon for the App Store (required for all apps) | 1024 x 1024 (recommended) | 1024 x 1024 (recommended) | 512 x 512 | 1024 x 1024 (recommended) | 512 x 512 | “App Icons” |
| Launch image (required for all apps) | 640 x 1136 | 640 x 960 | 320 x 480 | 1536 x 2008 (portrait)
2048 x 1496 (landscape) |
768 x 1004 (portrait)
1024 x 748 (landscape) |
“Launch Images” |
| Small icon for Spotlight search results and Settings (recommended) | 58 x 58 | 58 x 58 | 29 x 29 | 100 x 100 (Spotlight search results)
58 x 58 (Settings) |
50 x 50 (Spotlight search results)
29 x 29 (Settings) |
“Small Icons” |
| Web clip icon (recommended for web apps and websites) | 114 x 114 | 114 x 114 | 57 x 57 | 144 x 144 | 72 x 72 | “Web Clip Icons” |
| Toolbar and navigation bar icon (optional) | Approximately 40 x 40 | Approximately 40 x 40 | Approximately 20 x 20 | Approximately 40 x 40 | Approximately 20 x 20 | “Icons for Navigation Bars, Toolbars, and Tab Bars” |
| Tab bar icon (optional) | Approximately 60 x 60 | Approximately 60 x 60 | Approximately 30 x 30 | Approximately 60 x 60 | Approximately 30 x 30 | “Icons for Navigation Bars, Toolbars, and Tab Bars” |
| Default Newsstand cover icon for the App Store (required for Newsstand apps) | At least 1024 pixels on the longest edge | At least 1024 pixels on the longest edge | At least 512 pixels on the longest edge | At least 1024 pixels on the longest edge | At least 512 pixels on the longest edge | “Newsstand Icons” |