The best alternatives to TsterApp are ProtoPie, Fuse (Pre-launch), and Prototypr. If these 3 options don't work for you, we've listed a few more alternatives below.
ProtoPie is the easiest tool used to turn your UI/UX design ideas into highly interactive prototypes for mobile, desktop, web, all the way to IoT. Designers can explore, validate, and test design solutions and ideas by creating very realistic, production-like prototypes without code and the help of engineers.
CanvasFlip is fastest growing prototyping suite to create and validate your application design prototypes for your mobile and web applications. CanvasFlip is a cloud-based design collaboration and testing...