ProtoPie offers Free Trial, but Fluid UI does not.
Fluid UI is designed for Large Enterprises, Medium Business and Small Business.
ProtoPie is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Fluid UI Starts at $8.25/Month when Billed Yearly whereas for ProtoPie Starts at $11/Month when Billed Yearly.
Some top alternatives to Fluid UI includes Miro, UX-App, HotGloo, Balsamiq, MockupTiger, Axure RP, Wireframe.cc, Claritee, Stage and Zen Wireframe.
Some top alternatives to ProtoPie includes Miro, Adobe XD, UX-App, Balsamiq, Axure RP, Wireframe.cc, Claritee, Stage, Framer X, Zen Wireframe and Proto.io.