So, what does it do? How does it work? Who are you and why did you build this? Can I try it without signing up for anything? How much does it cost once I do

So, what does it do? How does it work? Who are you and why did you build this? Can I try it without signing up for anything? How much does it cost once I do sign up? These are all questions I would want to see answered on the site before I begin to think about trying it out.