Is this http://buildbook.us/ http://buildbook.us/ ? (https://news.ycombinator.com/item?id=40193095 https://news.ycombinator.com/item?id=40193095) How is it adve

Is this http://buildbook.us/ http://buildbook.us/ ? (https://news.ycombinator.com/item?id=40193095 https://news.ycombinator.com/item?id=40193095) How is it advertised because the homepage doesn't really tell what it is.