Infinite Painter is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is SketchBook, which is free. If that doesn't suit you, our users have ranked more than 10 alternatives to Infinite Painter and three of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Infinite Painter are Linea (Paid) and HEAVYPAINT (Freemium).
Linea is an elegantly simple sketchbook for Apple devices optimized for use with Apple Pencil. It opts for a minimal interface with only the essential options, rather than overkill like many other apps.