The best alternatives to App icon Generator: icon Maker are Make App Icon, App Icon Generator, and App Icon Resizer. If these 3 options don't work for you, we've listed a few more alternatives below.
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Generate your app icons in seconds for iOS, watchOS, iMessage Apps, macOS and more with just a drag, a drop and a click! All of your icons are then exported into a folder, named by size and automatically converted to PNG ready for use.