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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.
Google Ads Keyword Planner API, the single upstream source feeding search volume data into Ahrefs, Semrush, Moz, and nearly every other SEO platform, returns estimates bucketed into ranges that can span 10x.
Ahrefs charges $129/month at its entry tier. Semrush starts at $139.95/month. Running both alongside a content optimization tool pushes monthly spend past $350 before you factor in annual commitments.
Ahrefs and Semrush pull keyword data from fundamentally different pipelines — different crawlers, different clickstream providers, different difficulty algorithms.
Google Search Console, a crawler, a keyword database, and a spreadsheet form the mechanical skeleton of every solo SEO tool stack that actually produces results. The common mistake people make when assembling this stack isn't picking the wrong individual tools.
Three keyword research subscriptions running simultaneously is the median for mid-size SEO teams, and almost nobody can articulate why they need all three.