SpyFu

SpyFu is a competitive intelligence platform designed for SEO professionals and digital marketers who need to research their competitors' search strategies. The tool provides access to historical keyword data, PPC campaigns, and backlink profiles, allowing users to see which keywords competitors rank for organically, what ads they've run over the years, and where their backlinks come from. Unlike basic keyword research tools, SpyFu specialises in competitor analysis, offering a database that tracks keyword rankings and ad copy over time. The platform serves businesses and agencies looking to identify gaps in their own strategies by studying what works for competitors. Users can compare multiple domains side by side, discover shared and unique keywords, and analyse bidding strategies for paid search campaigns. SpyFu's historical data extends back over a decade for many domains, making it particularly valuable for understanding long-term trends and seasonal patterns in competitor behaviour. The tool focuses primarily on Google search data for the US market, though it includes some coverage of UK and Australian searches.