Yes, both AppDemoStore and Balsamiq offer a Free Trial.
AppDemoStore is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Balsamiq is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for AppDemoStore Starts at $20/Month whereas for Balsamiq Starts at $9/Month.
Some top alternatives to AppDemoStore includes Miro, NinjaMock, Balsamiq, Axure RP, Wireframe.cc, Inspireframe, Stage, Mockup Clips, Device Frames, Zen Wireframe and Mockframe by 500apps.
Some top alternatives to Balsamiq includes Miro, InVision, Pidoco, NinjaMock, Moqups, Axure RP, Wireframe.cc, Claritee, Stage and Zen Wireframe.