We recently launched our new AI detector. For almost any webpage, you can analyze the likelihood that AI was used to create it, highlight AI-generated sections of text, and even identify the specific AI models used to create the text.

There are tons of AI detectors available. And, while ours is the only one that can also show you any webpage’s backlinks and estimated search traffic, how the page content has changed over time, and how it performs relative to other pages…
…we still wanted to know how Ahrefs’ AI detector compares to other popular detectors. So we tested it.

Interestingly, false positives were not a big issue. Only 2/24 tests run on human-written content incorrectly flagged the text sample as AI-generated. All the AI detectors struggled the most with the hybrid human/AI content (for reasons explained below).
In the table below, you can see the actual AI content of each test article, followed by each tool’s analysis:
| Actual AI% | Ahrefs | Copyleaks | GPTZero | Originality.ai | Scribbr | ZeroGPT | Grammarly | Writer |
|---|---|---|---|---|---|---|---|---|
| 100% | 100% | 100% | 92% | 100% | 94% | 99.62% | 59% | 24% |
| 100% | 100% | 100% | 100% | 100% | 100% | 98.99% | 57% | 23% |
| 100% | 86% | 83.8% | 52% | 64% | 0% | 67.76% | 7% | 15% |
| 0% | 2% | 0% | 0% | 0% | 0% | 0% | 0% | 2% |
| 0% | 6% | 0% | 0% | 0% | 0% | 2.76% | 0% | 2% |
| 0% | 0% | 0% | 4% | 0% | 0% | 91.69% | 0% | 27% |
| 50% | 13% | 46.4% | 42% | 46% | 0% | 39.06% | 0% | 0% |
| 50% | 32% | 0% | 28% | 4% | 0% | 29.4% | 0% | 5% |
| 50% | 70% | 100% | 86% | 4% | 83% | 83.21% | 0% | 6% |
| Score | 13 | 13 | 12 | 12 | 10 | 9 | 6 | 4 |
Ahrefs’ AI Detector
Score: 13/18
URL: https://ahrefs.com/writing-tools/ai-content-detector

Ahrefs AI Detector showed good accuracy across the board, with no false positives for human-written content, and good detection for AI content. It also managed to detect the specific model types used for the AI content: GPT-4o and Meta’s Llama.
By my criteria, it failed one out of nine tests, struggling to identify AI content that was blended with human writing. This is a known limitation of all AI detection tools (more on that below), and was true of all detection models.
Ahrefs AI detector is based on our own proprietary detection model, trained on a huge amount of web content. It’s unique among AI detectors because you can use it in conjunction with tons of other Ahrefs data points to see how content actually performs.
You can use Ahrefs’ AI detector to see:
- Which AI models are the best for creating high-quality content.
- How often your competitors publish AI content, and which models they use.
- How much AI content is present in a particular SERP, and how much effort you might need to invest to rank.
- How organic performance metrics correlate with different levels of AI use, like search traffic, keyword rankings, and backlinks.
- Whether AI content use correlates with traffic drops on particular pages or in particular subfolders.
How to use Ahrefs’ AI detector
Start by heading to Site Explorer and pasting the URL you want to analyse. From there:
- Click the Page inspect report tab in the left sidebar.
- Choose the AI Detector tab.
- See your AI content level report in the right sidebar. Text that our model has detected as likely AI-generated will be color-coded according to the colors in the pie chart
In this example, our AI detector has found a section of my blog post that I used ChatGPT’s GPT-4o model to generate:

From there, you can also see how the page content has changed over time, how many backlinks it has earned, how many keywords it ranks for, how much estimated organic traffic it receives…
You can also test out the model via our free AI content detector page. We’re also adding bulk AI content detection to the Top pages report in Site Explorer (coming soon).
Copyleaks
Score: 13/18
URL: https://copyleaks.com/ai-content-detector
Copyleaks matched the top score, showing solid detection ability across both extremes of AI content. It proved especially effective at catching obvious AI writing, though it occasionally faltered in mixed or borderline passages.

GPTZero
Score: 12/18
URL: https://gptzero.me
GPTZero offered reliable results overall, with a clear strength in catching high-percentage AI content. However, it sometimes hesitated in assigning confident AI probabilities to mid-range or hybrid examples, slightly affecting its total accuracy.

Originality.ai
Score: 12/18
URL: https://originality.ai/ai-checker
Originality.ai performed well in most cases, accurately flagging AI-heavy text but showing a tendency to overestimate human authorship when faced with subtle or well-edited AI-generated material.

Scribbr
Score: 10/18
URL: https://www.scribbr.com/ai-detector/
Scribbr landed in the middle of the pack, handling clear-cut AI content reasonably well but displaying a drop in performance on more nuanced pieces, where its predictions tended to be inconsistent or overly cautious.

ZeroGPT
Score: 9/18
URL: https://zerogpt.com
ZeroGPT’s performance was uneven—it occasionally nailed high-AI content but frequently misclassified partial-AI and low-AI samples. The tool’s sensitivity seemed skewed toward extremes, resulting in a less balanced profile.

Grammarly
Score: 6/18
URL: https://www.grammarly.com/ai-detector
Grammarly’s free AI detector struggled with accurate AI detection, offering low-confidence or inaccurate predictions in many cases. It often failed to recognize clear signs of AI authorship and was unreliable on mixed or borderline content.

Writer
Score: 4/18
URL: https://writer.com/ai-content-detector/
Writer’s free AI detector scored the lowest, frequently misidentifying or entirely missing AI-generated material. It lacked precision across the board and provided little useful signal even when dealing with content that was 100% AI-written.

Further reading

It’s clear that AI content isn’t going away, so it’s a good idea to use a tool like Ahrefs’ AI detector to understand how AI content impacts your website performance. To get started, head to Site Explorer.
Similar Posts

You Can’t Track AI Like Traditional Search. Here’s What to Do Instead.
Traditional search tracking is built on a simple promise: type a query, get a result, and track your ranking. AI doesn’t work that way. Assistants like ChatGPT, Gemini, and Perplexity don’t show fixed results—they generate answers that vary with every run, every model, and every user. “AI rank tracking” is a misnomer—you can’t track AI like you…

100 Most Cited Domains in Google’s AI Mode
Article Performance Data from Ahrefs Linking websites The number of websites linking to this post. Get the week’s best marketing content We analyzed our Brand Radar database of 5.5 million AI Mode queries to identify the domains that appear most often in Google’s AI Mode responses. These are the 100 most cited domains, along with…

The best products to sell online in 2025
Whether you’re starting your first business, looking for new products to sell, or launching your tenth brand, navigating the rapidly evolving world of ecommerce to sell products requires thorough research and a sharp focus on trends and strategies. Successful online businesses understand the importance of making informed decisions at every step of the research and…

US tariff and shipping policy changes: Navigating the end of the de minimis exemption
On August 29, 2025, the US government suspended the de minimis exemption for goods imported from all countries. This exemption previously allowed international shipments valued under $800 to enter the US duty-free and with simplified customs processing. This change is most likely to impact online shoppers and small businesses in the US who source supplies…

Scattered Spider: Understanding Help Desk Scams and How to Defend Your Organization
In the wake of high-profile attacks on UK retailers Marks & Spencer and Co-op, Scattered Spider has been all over the media, with coverage spilling over into the mainstream news due to the severity of the disruption caused — currently looking like hundreds of millions in lost profits for M&S alone. This coverage is extremely…
![7 Best VPS Hosting in Russia 2025,May🇷🇺[Reviewed]](data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNzAiIGhlaWdodD0iNzIiIHZpZXdCb3g9IjAgMCAyNzAgNzIiPjxyZWN0IHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiIHN0eWxlPSJmaWxsOiNjZmQ0ZGI7ZmlsbC1vcGFjaXR5OiAwLjE7Ii8+PC9zdmc+)
7 Best VPS Hosting in Russia 2025,May🇷🇺[Reviewed]
Do you want to attract Russian visitors to your blogging/business website? Even more, do you require Separate Dedicated Resources such as CPU/RAM/Storage for your upscaling websites that too at a fair price? Do you have an e-commerce website and wish to expand into the Russian economy? Try Using the Best VPS Hosting Services from Russia,…






![7 Best VPS Hosting in Russia 2025,May🇷🇺[Reviewed]](https://gooooood.net/wp-content/uploads/2025/05/7-best-vps-hosting-in-russia-2025mayf09f87b7f09f87bareviewed.png)