Docktor 4+

Docktor makes it super easy to preview your app icons directly in the Dock.

Hi, this is your friend Rafa: I built this app to make my own life a little bit easier and hopefully yours too, for us who make Mac apps the app icon is extremely important and hopefully special, that's why I like to preview the designs as I go directly where they'll live — the Dock!

▼ Just drag and drop the icon on Docktor and preview it in the Dock
▼ … or you can also drop it directly in the Dock
▼ … or … or you can drag it directly from your favorite design tool (Sketch, for me) for a super fast workflow.
▼ and it keeps a history of all the icons you've previewed, where you can easily compare them by using the arrow keys.
▼ it also includes useful links for App Icon guides, and Sketch templates.