Visual development of a web application prototype: is there an alternative to Sencha Architect?

Question

JavaScript

You need to design a working prototype of a web application (asynchronous, one-page - that's all). The ideal option, as it seems to me from the videos, is Sencha Architect, but not only does the license cost a lot of money for the non-profit medical organization in which I work, I also can’t download the trial.
Guys, tell me, please, alternatives (preferably free, but you can also for moderate money) to the above software.
My goal is to create a working prototype, test it in combat conditions and, with the results and presentations, go to the head physician to beg for a normal development.

Answer 1

Maybe xd will work for you . It's definitely free to develop a single project and includes prototyping capabilities.