Is the pricing structure documented somewhere and did I just miss it? If not, I would encourage the author (if he sees this) to please publish it, as I like to know how much something might cost me before making it part of my set of tools.
Just a quick heads up: I'm a weirdo with WebRTC disabled by default which broke app.paircast.io for me. Because the pricing page embeds pricing from app.paircast.io, that failed for me, too, until I enabled WebRTC.