SpyFu is built around a historical database of search results and paid ads. For any domain it reports the keywords it ranks for, the keywords it has bid on, the ad variations it has run and the estimated monthly spend, with history stretching back over a decade. It also includes keyword research, rank tracking and backlink outreach features, but those are secondary to the competitor intelligence. Its pricing is flat and low compared with the major suites, and the Basic plan places no cap on search results or data exports, which is unusual at this price.
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