Yes, both Hava and Microsoft Visio offer a Free Trial.
Hava is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Microsoft Visio is designed for Medium Business and Small Business.
Pricing for Hava Starts at $44/Month when Billed Yearly whereas for Microsoft Visio Starts at $5/User/Month.
Some top alternatives to Hava includes Microsoft Visio, CloudSkew, AutoCloud, Isoflow, Designer, Cloudcraft, Lucidscale, Hyperglance, Qualified, Workvivo, AWS CloudFormation and IFTTT.
Some top alternatives to Microsoft Visio includes Miro, FigJam, SmartDraw, Gliffy, DrakonHub, Creately, 10SCAPE, Sankey Flow Show, Lucidchart, EDraw Max, Quick Diagram and diagrams.net.