SimpleDiagrams is a desktop app for quickly creating diagrams, processes, workflows, idea sketches, and more. It has a simple user interface, so you won't spend time reading a manual. The consistent, hand-drawn look keeps your ideas and messages clear. SimpleDiagrams comes with over 500 shapes, and there are more free downloads on the website.
So don't cloud your visuals with "polish." Leave that for the specialists. Keep your message clear with SimpleDiagrams.