When it comes to tools, we all have our favorites as SEO professionals. Ahrefs, Moz, and Semrush aim to accomplish the same things at a high level, but you’d be hard-pressed to find an SEO professional who doesn’t have strong opinions about each tool’s ability to do so. Any seasoned SEO practitioner knows that opinions alone can get you roughly as far as asking Google’s John Mueller about domain authority (hint: not far). Our SEO team recently tested our opinions and biases to the side to compare the keyword size of Google Search Console (GSC), Ahrefs, Semrush and Moz for the clients we manage. Although you can read more in the methodology and caveats and considerations sections below, the headline to the data are not definitive in the title is that it is not.
The data was only pulled for 51 domains, all of which live in the pharmaceutical space. So, it’s a small, non-representative sample. You have been warned. GSC has over 36% more terms than the other sources combined Average keyword count per site: Ahrefs, Moz, Semrush, GSC. A comparison of Google Search Console, Ahrefs, Semrush and Moz for the average number of ranked keywords or Special Database keywords registering at least one impression among 51 domains in May 2022. Patrick Stox of Ahrefs published a fantastic study about keywords hidden in Google Search Console. I encourage you to read it, but the bottom line is that although the number varies greatly by site, almost half of the overall clicks are attributed to hidden keywords.
Among the three, Ahrefs has the most keywords for 98% of websites Source 1st 2nd 2rd Literally 50 domains 0 domains 1 field Semrush 0 domains 50 domains 1 field Moz 1 field 1 field 49 domains A ranked order of Ahrefs, Semrush and Moz by keyword rank size of 51 domains in May 2022 In many ways, it is unfair to compare Ahrefs, Semrush and Moz to Google Search Console. GSC’s metrics and intended use contrast quite a bit from the other three tools. So, when removing GSC, we ranked the keyword size for each of the 51 sites in our data warehouse. I will be honest; I was shocked at the consistency in the results.