While basic, Bulk Custom Icon for Mac performs its sole function of applying icons to folders quite well. Since its interface allows drag and drop, it's easy to use, and you can apply your preferred icon to one folder or multiple items very quickly.
To use this free application, you just need to drag it to a location of your choice. There are no instructions readily available on how to use Bulk Custom Icon for Mac, but the program comes with a basic and (mostly) self-explanatory user interface. The left side of the window, which is clearly labeled, is for dragging the icon image. Almost any image, even ones a user creates, can be selected. Once set, the image appears in the window, giving the user the ability to confirm the choice. On the window's right side, the user can drag files and folders into the program. This automatically applies the icon image immediately. Several files can be grouped together, making batch processing much easier. The lack of confirmation features or a separate button to start the program could be a problem for the novice user since it would be easy to mistakenly apply an icon if you aren't paying attention, but the learning curve here is still very low. During testing, the program completed the icon applying process quickly and without any glitches.
Bulk Custom Icon for Mac performs its main function well and is really easy to use. It would be a useful application for users in need of a program to easily apply a custom icon to any number of files.