Yes, both Mockflow and NinjaMock offer a Free Trial.
Mockflow is designed for Large Enterprises, Medium Business and Small Business.
NinjaMock is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Mockflow Starts at $14/Month when Billed Yearly whereas for NinjaMock Starts at $7.69/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 NinjaMock includes Miro, HotGloo, Pidoco, Balsamiq, Wireframe.cc, Wirify, Claritee, Stage, Mockup Clips and Zen Wireframe.