VSDX Annotator is an app that helps you view, edit, and convert Visio drawings on Mac. It provides a wide range of annotation possibilities, along with sharing visual documents in a multi-platform environment. The program provides you with 12 annotation tools. The app allows to add notes, callouts, comments, blocks, graphic files etc. VSDX Annotator makes it able to review Visio flowcharts, diagrams, schemes, drawings, and annotate them on your Mac.