Kahdoo alternatives

Hi Stan. I wish you a good luck! I like your product, it's really helpful for the modern life and customers. I am a person who can't buy without reading overviews about the product. So that I think I need it. As for my notes, here: 1. I don't understand the importance of sign up. Should I sign up or I can use only the main page for searching? Your website created feelings that this is a search resource like the home page of Google 2. Is there the history of searching in the account? What advantages will I get if I sign in? 3. What is your monetisation model? By the way I liked the product. It's interesting and easy. My upvote to you.