The best alternatives to Madhat are Lucidchart, Web Sequence, and We Draw Comics. If these 3 options don't work for you, we've listed a few more alternatives below.
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Lucidchart is your solution for visual communication and cross-platform collaboration. Create professional flowcharts, process maps, UML models, org charts, and ER diagrams using our templates or import feature.
Web Sequence is a Chrome extension that saves your time and helps you avoid common mistakes when drawing sequence diagrams. You don't need to drag and drop or resize. Just type in your code (a DSL but like Java and C#) and a diagram is generated for you. Just added HTTPS support. If you are experience issues, please leave comments.