Lebesgue compiles metrics from different ad platforms, which would otherwise be a long hands-on process. You just can't get this kind of information using Google or FB analytics - don't forget that ad platforms have a different goal than you do: they primary goal is to sell you the ads, not to sell your product. You can't make objective business decisions using these platforms alone, but with Lebesgue, you can - with Lebesgue, your goals are aligned.