Gliffy is software for diagramming via a HTML5 cloud-based app. It is used to create UML diagrams, floor plans, Venn diagrams, flowcharts and various other kinds of diagrams online. Developed by Gliffy, Inc.
License: Freemium
Dia is an open-source diagramming tool that offers a wide range of diagram types and is highly customizable, making it suitable for technical users. In contrast, Gliffy is a cloud-based solution that provides a more user-friendly experience, ideal for teams needing real-time collaboration.