SEOTesting pulls your Google Search Console data, stores more history than Google's own interface keeps, and layers testing on top: mark the date a change went live and it compares before and after, or define a control group of pages for a split test. It also produces reports on striking-distance keywords, content decay, cannibalisation and query-level trends that are tedious to build by hand in GSC. It uses your own first-party data rather than a third-party index, which makes it accurate for your site and useless for spying on anyone else's.
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