: While the specific "Designer" version (which included vector support) is defunct, a modern version of Sketchbook for Mac is available on the Mac App Store.
If you need SketchBook specifically for compatibility with old project files, you may need to purchase a legacy license from a third-party reseller (though this is risky). Otherwise, I strongly recommend switching to a modern, supported free alternative like Krita.
The software was replaced in many professional workflows by SketchBook Pro , which focuses primarily on raster graphics but lacks the specific vector manipulation tools that made Designer 2013 unique.
There are four primary reasons this specific search persists over a decade later:
: Included official Copic digital color sets, making it a favorite for traditional artists transitioning to digital. Limitations Discontinuation
The Evolution of Autodesk SketchBook Designer 2013 for Mac OSX