What is AI dark traffic?
Visits that come from AI assistants but show up as direct traffic in your analytics, because the referrer got lost along the way.
AI dark traffic is the visits that reach a site from an assistant's answer but that analytics records as direct traffic, because the source information got lost along the way. It isn't a measurement error on the site: it's a consequence of how links are opened from an app. The practical effect is that the channel looks smaller than it is.
Why does the source get lost?
A web analytics tool knows where a visit comes from thanks to the referrer, a piece of data the browser sends when moving from one page to another. That data disappears in two common situations:
- The answer was read in a mobile app. When the link is opened from an assistant's app, the referrer often isn't passed along. The visit arrives without a sender.
- The user didn't click anything. They read your name in the answer, typed it into the browser or searched for your business separately. There's no link to track.
Do all engines behave the same way?
No, and the difference is large.
| Engine | How the traffic arrives | Can it be identified |
|---|---|---|
| ChatGPT | Adds utm_source=chatgpt.com to the links in its citations |
Yes, it arrives tagged in analytics |
| The other engines | Rely on the referrer, which gets lost when opened from a mobile app | Partially: a share lands as direct |
| Any of them, with no click | The user searches for the business on their own | Not as traffic; it shows up as an increase in branded searches |
Source for the utm_source detail: OpenAI help center,
Publishers and Developers FAQ.
So how is it measured?
With three separate signals, without pretending they add up to an exact figure:
- Visible traffic. The visits that do arrive tagged, mostly ChatGPT's. It's the floor, not the total.
- An estimated range of dark traffic. Estimated by watching how direct traffic moves against the historical baseline, on the same pages that appear cited in the answers. It's an estimate with a range, not a number.
- Branded searches. The increase in queries with your name in Search Console. It's the cleanest signal of the no-click effect: someone came across you somewhere and went looking for you.
Can a sale be attributed to an AI mention?
Partially, and it's worth saying it that way. With the tagged part you can follow the full path to conversion. With the rest you can't: what there is, is a correlation between what happened in the answers and what happened in traffic and branded searches.
That's a signal, not attribution. Anyone who promises exact attribution from a mention to a sale is selling a certainty that doesn't exist today.
Related terms
See also mention and citation and AI crawlers.