SpyFu
SpyFu provides competitor keyword research tools for AdWord that exposes the search marketing secret formula of your most successful competitors.
SpyFu provides competitor keyword research tools for AdWord that exposes the search marketing secret formula of your most successful competitors. With SpyFu, you can check every keyword they've ever bought on Google, every ad test they've run, and see every keyword they rank on together with the exact content and backlinks that let them outrank you.