Icon Pro let's you quickly create icon assets for your iOS/OSX apps: Just drag your high resolution artwork (preferably, a PNG file at 1024x1024) into the app's window, select a directory for exporting the results, and you're set.
Icon Sizes Exported
iOS:
1. 29 pt @2x, 29 pt @3x
2. 40 pt @2x, 40 pt @3x
3. 60 pt @2x, 60 pt @3x
4. 29 pt @1x, 29 pt @2x
5. 40 pt @1x, 40 pt @2x
6. 76 pt @1x, 76 pt @2x
7. 83.5pt
8. 1024pt @1x
macOS:
1. 16x16
2. 32x32
3. 64x64
4. 128x128
5. 256x256
6. 512x512
7. 1024x1024
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