What is a free/inexpensive equivalent of a rapid prototyping service like MockFlow?

Question

Layouts and prototypes

Actually, everything is stated in the subject. We need a service (or a desktop application in general) for rapid prototyping. Either free or inexpensive. So far I'm using MockFlow in free mode, but it has a lot of limitations. The minimum paid plan costs 19 bucks a month, which is a little expensive for me. I’m not psychologically ready to give more than $ 10 for such a thing. Can you suggest something?

Answer 1

I'll answer myself. https://wireframe.cc/ - simple and fast service.

Answer 2

There is nothing more powerful than Axure, but it is expensive... https://www.axure.com/
The closest analogue of balsamiq , just $9.