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Store Growers tested 10 commercial keywords across Google Keyword Planner, Semrush, Ahrefs, and SpyFu and found that no two tools agreed on volume for a single term.
Ahrefs, Semrush, and Google Keyword Planner report different search volume numbers for the same keywords because each tool collects, models, and categorizes search data through fundamentally different methods.
Ahrefs and Semrush pull keyword data from fundamentally different pipelines — different crawlers, different clickstream providers, different difficulty algorithms.
Seventy percent of what Ahrefs does, Semrush also does, and vice versa. The keyword databases differ at the margins, the backlink indexes vary by a few percentage points in coverage, and each platform has a handful of proprietary features the other lacks.