OmniGraffle is a diagramming and digital illustration application for macOS and iOS. Developed by The Omni Group
License: Commercial
ConceptDraw PRO is a versatile tool with strong integration and customization options, ideal for professionals needing detailed diagrams. OmniGraffle, on the other hand, offers a more user-friendly experience with excellent mobile access, making it suitable for users who prioritize ease of use and collaboration.