ikonik - XCAssets Generator is an application designed to help you create icons for macOS, iOS, and watchOS. The source image supports being edited in terms of brightness, saturation, and transparency for better results.
The utility opens with a clean and simple interface. It has a dark-colored appearance which, unfortunately, can't be changed into light mode. All functions are displayed conveniently in the main window, so you won't need to search for hidden menus to optimize and enable the conversion. The tool can make icons for Mac, iPhone, iPad, and iWatch, yet only the latest device is supported by the free version. Loading the source image for icon generation is done using drag-and-drop gestures. Once the picture is imported, you have the chance to modify the image transparency, saturation, and brightness. If desired, you can add a color of your choice to transparent icons simply by dragging a slider. The moment you finish editing the picture, generating the icons is done easily with just one click. However, you should know that the editing features are available only for PNG files. If you load images in other formats, the editing block is no longer displayed.
In short, ikonik - XCAssets Generator offers a straightforward solution to create icons optimized for your device. The tool offers in-app purchases that remove the limitation related to the devices supported for free.