MakeIcons is a very simple to use app for macOS that will produce a range of different size icons for Xcode developers to use in their app development. Simply create a large version of your icon using your favorite graphics app, and drop it onto the canvas. You can then either click a button to produce iOS and watchOS icons, or another button for macOS icons. You can also create any size icon you want as Apple introduces new icon sizes, without waiting for the latest version of the app to include these new sizes. It is fast and simple, and I have created an extra bonus whereby you can also create TabBar item icons. iOS icons are produced for more than 10 different sizes, at x1, x2, and x3 resolutions, and watchOS and macOS get x1 and x2 resolutions. You can then simply drag and drop all of the icons into Xcode, and they will all go into their appropriate image slot (you may need to make a few minor additions for any empty slots). TabBar item icons can also be made at different sizes, as per Apples user interface guidelines.