74% of up-to-date websites include the content of artificial intelligence (study on pages 900,000)

In April 2025, we analyzed 900,000 newly created websites and found that 74.2% of them contained content generated by AI.

At Ahrefs, our machine learning team has built a AI content detector (named bot_or_not). We will soon release AI content detector for Ahrefs clients, so we decided to take it over at its pace with the question we die to answer:

What percentage of up-to-date content is generated AI?

We used bot_or_not To analyze 900,000 English -speaking websites, which were newly detected by our Web Crawler in April 2025. We analyzed one page for the domain (so we tested the content from 900,000 different domains). Each page has been categorized according to the percentage of the page detected by our model as generated AI.

Here’s what our content detector found:

• 2.5% The pages were classified as “pure AI”.
• 25.8% They were classified as a “pure man”.
• 71.7% They were classified as a mixture of these two.

Among those who contained a mixture of AI and human content:

• 25.86% showed moderate apply of AI (11-40% of the content of the page was classified as AI)
• 20.50% showed a significant application of AI (41-70%)
• 15.51% showed the dominant apply of AI (71–99%)

I was surprised that almost three -quarters Of the analyzed pages, it included AI content. But the longer I sat with the data, the more it made sense.

Free, quick generation of AI content is native to Google Docs, Gmail, LinkedIn. AI can summarize the slack messages, conduct articles, shorten transcriptions. This is actively challenging To avoid a enormous, shiny “Generate” button and will become only more challenging, because generative artificial intelligence becomes additionally embedded in applications.

And, as the AI ​​is created as the AI ​​is created, the up-to-date content that reference This content generated by AI in turn will contain material generated by AI. The presence of AI content will spread at an increasingly faster pace, sealing everything it affects to a greater or lesser extent.

If more validation was needed when I conducted a survey of 879 content marketers, 87% reported with artificial intelligence to create or support in creating content. Only 13% reported that it did not apply AI to any extent.

And, which is not surprising, blog posts were the most common type of content created by AI:

LLM is too comfortable and too affordable to ignore them. The apply of generative artificial intelligence in creating content quickly becomes default.

No AI content detector is perfect. Different detection methods have different strengths and weaknesses, but all tools for detecting artificial intelligence have similar struggles: they are often trained on narrow data sets, struggle with partial detection and are susceptible to humanizing tools.

Our team understands these restrictions and built our tool for these problems. We had great results from the testing of our content detector on the content of Ahrefs, but-as every other content detector leading on the market-the next-and-free detector will not be 100% correct.

But no SEO record is 100% correct. We all apply the search volume to shape our strategy, but as we wrote earlier, there is no such thing as a “correct” search volume. In the same way, detection of AI content can be extremely helpful without being perfect.

You can see how much AI content publishes your competitors whose models apply and how it changes over time.

You can estimate how much AI content is present in a specific SERP, and work out if you need to invest more effort to argue.

You can even understand how organic performance indicators, such as search movement, keyword rankings and feedback, correlate with different levels of using artificial intelligence (as he wrote, we conduct a study on this subject).

These tools should not be used in isolation to make decisions about life or death in the matter of someone’s career-but they are a great source of data for high-performance marketers in the AI ​​content era.

Start using our up-to-date AI content detector

Our tool for detecting artificial intelligence will soon be launched as part of Site Explorer. You will also be able to try our model for free as part of our renewed free AI content detector.