Yes, both Miro and Claritee offer a Free Trial.
Miro is designed for Large Enterprises, Medium Business and Small Business.
Claritee is designed for Individuals, Medium Business and Small Business.
Pricing for Miro Starts at $8/User/Month when Billed Yearly whereas for Claritee Starts at $10/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 Claritee includes Miro, NinjaMock, Balsamiq, Moqups, Axure RP, Wireframe.cc, Wirify, Stage, Previewed, Zen Wireframe and Mockframe by 500apps.