Yes, both Miro and CardBoard offer a Free Trial.
Miro is designed for Large Enterprises, Medium Business and Small Business.
CardBoard is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Miro Starts at $8/User/Month when Billed Yearly whereas for CardBoard Starts at $8.50/User/Month when Billed Yearly.
Some top alternatives to Miro includes Collaboard, Microsoft Whiteboard, WhiteboardFox, Conceptboard, MURAL, Lucidspark, Whimsical, Board, Zoom Whiteboard and Witeboard.
Some top alternatives to CardBoard includes Collaboard, Miro, FigJam, StoriesOnBoard, SmartDraw, Gliffy, DrakonHub, FlowMapp, diagrams.net, FeatureMap, Board and HackerDraw.