Ahrefs Says Referral Traffic Undercounts AI’s Signup Influence

AI ranked ahead of YouTube as a source of signups for Ahrefs and trailed only Google, according to the company’s account of its own measurement. The finding highlights a gap between the role a channel can play in attracting customers and the role assigned to it by referral traffic data.

Ahrefs says that judging AI solely by referrals would have substantially understated its contribution. The company argues that much of AI’s influence is not visible in that traffic measure. Its comparison puts AI above YouTube in the signup ranking, even though referral traffic alone would not have conveyed the same picture.

The distinction matters when marketers compare channels. A signup source and a referral source are not necessarily interchangeable measures: Ahrefs’ account shows that focusing on the latter can produce a narrower view of AI’s role. The reported ranking concerns Ahrefs’ experience and should not be treated as a benchmark for every business.

The finding also does not mean referral data has no value. Rather, it suggests that a channel assessment can be incomplete when it rests on referral traffic alone. Marketers considering AI alongside established sources such as Google and YouTube may need to distinguish between what their referral reports show and the broader contribution they are trying to assess.

That distinction is particularly important when using channel comparisons to make decisions. A ranking based on signups answers a different question from a review of referral traffic. Keeping those measures separate can help teams avoid presenting a traffic figure as a complete account of how a channel contributes to customer acquisition.

What this means for marketers

Review AI referral traffic as one part of your measurement rather than as the entire answer. When comparing AI with other channels, make clear whether the comparison concerns visits or signups, and consider what the available data can and cannot show. Treat Ahrefs’ ranking as an example of why that distinction matters, not as a prediction of results for your own business.