Gliffy offers Free Trial, but WebSequenceDiagrams does not.
WebSequenceDiagrams is designed for Individuals, Medium Business and Small Business.
Gliffy is designed for Large Enterprises, Medium Business and Small Business.
Pricing for WebSequenceDiagrams Starts at $15/Month whereas for Gliffy Starts at $8/Month when Billed Yearly.
Some top alternatives to WebSequenceDiagrams includes Miro, FigJam, SmartDraw, Gliffy, Microsoft Visio, QuickDBD, DrawSQL, UpDiagram, Quick Diagram, diagrams.net, yEd Graph Editor and Colibri Diagram.
Some top alternatives to Gliffy includes Miro, FigJam, SmartDraw, Cacoo, Microsoft Visio, DrakonHub, Creately, Lucidchart, EDraw Max, DrawSQL, Quick Diagram and diagrams.net.