Can I make Xcode app icon with 512x512 icon instead of recommended 1024x1024? I'm following this tutorial on making icons for a React Native app using Xcode. It recommends using Icon Set Creator to make the set of icons of various sizes for iOS, and Android Asset Studio for Android. In both of these, they instruct you to drag and drop your original icon, which the apps will convert into icons of the sizes you need. The problem is that they both say to use an original image of at least 1024x1024 pixels, but mine is 512x512.

One of the icons the apps generate is 1024x1024, so I know for this one the  image quality will suffer. What I want to know is, will this be a problem in practice? Does anyone know where that 1024x1024 image gets used, and will it be a problem that the image quality is cut in half for that icon?
Your app icon is displayed in many places, including in Finder, the Dock, Launchpad, and the App Store. To ensure that your app icon looks great everywhere people see it, provide it in the following sizes.

512px × 512px (512pt × 512pt @1x)
1024px × 1024px (512pt × 512pt @2x)

https://developer.apple.com/design/human-interface-guidelines/macos/icons-and-images/app-icon/

Technical Q&amp;A QA1686 lists the specific uses of each icon size in iOS, but I can't find an equivalent resource for macOS.
You should use an actual 1024px image if at all possible. An upscaled icon may be rejected by App Store Review.