Ahrefs Web Analytics Review: Tracking AI Referrals, Landing Pages, and Events

What does it offer?

Pricing, from Ahrefs' help centre, is per project: free up to 1 million events a month, $99 a month up to 5 million, $299 up to 20 million and $999 up to 100 million. You need an Ahrefs account, but not a paid Ahrefs subscription, to use the free tier.

How good is the AI referral tracking?

For a quick view it works well. GA4 now has a similar built-in AI Assistant channel, so the difference is less about setup than about the lighter, cookie-free script and the ready-made 404 report. You can see which assistants send visits, which pages they land on, and, with events set up, whether those visitors convert.

The limits are the same as for every referrer-based tool:

• Missing referrers. Some app and in-app browser visits arrive without a referrer and show up as direct traffic.
• Clicks only. An AI answer that recommends you without a link click leaves no trace.
• Assistant, not question. You see that a visit came from ChatGPT, not what the user asked.

How teams combine analytics with other methods is covered in which tools teams use to track AI referrals and attribution, and ecommerce tracking in how to track orders from ChatGPT.

How Ahrefs Web Analytics identifies hallucinated URLs in AI traffic

The Possible 404 report uses a simple rule: a page counts as a possible 404 if it received visits and its page title contains “404” or “not found”. Because the tracking script runs on your error page, visits to URLs that do not exist still get recorded with their referrer. Filter the report to the AI search channel and you get a list of non-existent URLs that AI assistants sent people to.

Ahrefs used the same method in a September 2025 study of its anonymised Web Analytics data. It found that 1.01% of URLs clicked from ChatGPT landed on likely 404 pages, compared with 0.15% for Google, and that AI assistants overall sent visitors to 404 pages 2.87 times as often as Google Search. Claude was at 0.58%, Copilot 0.34%, Perplexity 0.31% and Gemini 0.21%.

Three cautions apply:

1. Your 404 page title must say so. If your error page's title is your brand name, the report will miss it. Set a title containing “Page not found”.
2. Not every 404 is a hallucination. Some are old URLs from a site migration or typos in links. Check the referrer and whether the URL ever existed.
3. Only clicked URLs appear. Invented URLs nobody clicked are invisible here.

Once you have the list, redirect frequently visited invented URLs to the closest real page, and consider whether a missing page reveals demand you should serve. The wider problem is covered in how AI answers send visitors to 404 pages.

How does it compare with other analytics tools?

Ahrefs' advantages are the free tier and the ready-made 404 report. GA4 remains more flexible for complex attribution and ecommerce reporting.

What should you weigh before installing it?

• Data use. Ahrefs' help centre says your data will not be available to competitors, but that it may publish studies from anonymised, aggregated data and use aggregated data to improve its services, including traffic estimation models. Some teams will be fine with that; others will not.
• Compliance. Ahrefs notes that site owners remain responsible for their own privacy obligations, including GDPR.
• Running two tools. Many sites run it alongside GA4. That is simple, but numbers will differ because the tools count visitors differently.

Ahrefs also offers a separate Bot Analytics feature that shows which crawlers, including AI bots, visit your site and which status codes they hit. That covers crawling, while Web Analytics covers human visits.

Who is it for?

• Small and mid-sized sites that want AI referral numbers and hallucinated-URL checks in a lightweight, cookie-free tool.
• Content and SaaS teams checking which pages AI assistants send people to, and fixing invented URLs.
• Existing Ahrefs users, who get Search Console and Ahrefs data in the same place.
• Less suited to large ecommerce sites that need revenue attribution across many channels, where GA4 or a dedicated analytics platform remains the main source.

We have not compared Ahrefs Web Analytics' AI channel numbers with GA4's on the same site. This review is based on Ahrefs' help centre, product page and published study.

What might this look like in practice?

Consider an illustrative project management SaaS, Raskmere, that installed Ahrefs Web Analytics alongside GA4. The AI search channel showed ChatGPT as the largest AI referrer, landing mostly on comparison pages. The Possible 404 report, filtered to AI traffic, listed a dozen invented URLs such as a pricing page for an “enterprise-plus” plan that never existed. The team redirected the most visited ones to the real pricing page, added a “Page not found” title to its error page so future cases would be caught, and set a custom event on trial sign-ups to see which AI landing pages converted.

What do people ask about Ahrefs Web Analytics?

Is Ahrefs Web Analytics free?

Yes, up to 1 million events a month per project. Paid tiers start at $99 a month for 5 million.

Does it use cookies?

No. Ahrefs says it uses no cookies or persistent identifiers by default.

Can it show AI mentions that did not lead to a visit?

No. It only records visits. Mentions without clicks need an AI visibility tracker.

How does it detect hallucinated URLs?

It flags visited pages whose title contains “404” or “not found”. Filtering those to AI referrals shows likely invented URLs.