With MixRank, brands can understand the ads and traffic sources that are working for their competitors. MixRank lets you see exactly where your competitors are buying ads and which ad copy is performing best for them across the Google AdSense network of almost 100,000 websites.
You can see what's working for them, and then set your plan of action! It's a remarkably comprehensive set of information that can give you a real edge. Pricing ranges from free for limited access to about $100 a month for deeper access to higher rates for enterprise access.