Despite the similar names, the Kelley Blue Book and Black Book are very different in terms of their usage and the type of information they provide. First of all, KBB is focused much more on the consumer level of the market. As we touched on in the introduction, KBB helps private buyers and sellers understand the market value of their car as a base point from which to formulate a fair and competitive price for their car. Black Book, on the other hand, is focused on retailers in the marketplace.