It looks interesting, but I have a few questions: "Sign up for free" makes it sound like it's eventually going to be a paid service, because that is the langua

It looks interesting, but I have a few questions: "Sign up for free" makes it sound like it's eventually going to be a paid service, because that is the language that all paid services use. I did not, however, find anything on the site with information about pricing. What is the status of this? What is the privacy policy? I would not require my students (I'm teaching a class of 75 in the fall) to sign up for something unless there was a solid, written guarantee protecting their privacy. I don't sign up for services just to test them out. It seems a bit "promiscuous" to me. Do you have a video demonstrating the process?