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The sizes of each icon are:
| iOS version | Device | Filename | Size |
|---|---|---|---|
| 8+ | iPhone 6 Plus | icon-60@3x.png | 180x180 |
| 7+ | iPhone / iPod Touch | icon-60.png | 60x60 |
| icon-60@2x.png | 120x120 | ||
| iPad | icon-76.png | 76x76 | |
| icon-76@2x.png | 152x152 | ||
| 6.1 | Spotlight Icon | icon-40.png | 40x40 |
| icon-40@2x.png | 80x80 | ||
| iPhone / iPod Touch | icon.png | 57x57 | |
| icon@2x.png | 114x114 | ||
| iPad | icon-72.png | 72x72 | |
| icon-72@2x.png | 144x144 | ||
| iPhone Spotlight and Settings | icon-small.png | 29x29 | |
| icon-small@2x.png | 58x58 | ||
| iPad Spotlight and Settings | icon-50.png | 50x50 | |
| icon-50@2x.png | 100x100 |
You can read more about the use of each icon size on Apples Apple's website:
https://developer.apple.com/ios/human-interface-guidelines/graphics/app-icon/
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