Yes, both Mockflow and Miro offer a Free Trial.
Mockflow is designed for Large Enterprises, Medium Business and Small Business.
Miro is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Mockflow Starts at $14/Month when Billed Yearly whereas for Miro Starts at $8/User/Month when Billed Yearly.
Some top alternatives to Mockflow includes Miro, NinjaMock, Balsamiq, Axure RP, Wireframe.cc, Mockplus, Inspireframe, Claritee, Stage, Zen Wireframe and Lightning Builder.
Some top alternatives to Miro includes Collaboard, Microsoft Whiteboard, WhiteboardFox, Conceptboard, MURAL, Lucidspark, Whimsical, Board, Zoom Whiteboard and Witeboard.