They have a broadly similar syntax for directed graphs, but Mermaid also provides a simple syntax for drawing UML sequence or class diagrams. You can draw class

They have a broadly similar syntax for directed graphs, but Mermaid also provides a simple syntax for drawing UML sequence or class diagrams. You can draw class diagrams with GraphViz, but it's comparatively kludgy [1]. [1]: http://www.ffnn.nl/pages/articles/media/uml-diagrams-using-graphviz-dot.php http://www.ffnn.nl/pages/articles/media/uml-diagrams-using-g...