The rapid development of AI tools has led to many positive changes.
However, there have also been some side effects and concerns:
At Originality.ai, it is our aim to encourage AI transparency, ensuring that AI-generated text is identified and not passed off as human-written using our accurate AI detector.
So, we routinely review AI humanizers and AI content generators to see if they are detectable by popular AI detection tools, like Originality.ai, GPTZero, and Writer.
One such tool that claims to bypass AI content detectors is Undetectable AI, which claims to generate undetectable AI content that is identified as “up to 100% human.”
So, as part of our review series, in this article, we’re reviewing Undetectable AI.
So, we decided to put it to the test. Full review below:
Undetectable AI is an AI humanizing tool that claims to turn AI-generated content into text that is more human-like, so that AI content detectors identify it as a human-written article.
For content creators seeking a shortcut around the limitations of human-scale speed, Undetectable AI may seem like an interesting offer.
Alongside an AI humanizer, Undetectable AI also offers the following features:
Undetectable AI’s products include both a web app and a Chrome extension.
In this article, we specifically reviewed whether Undetectable AI could make AI text undetectable to AI checkers using its humanizing features.
Undetectable AI works by first checking if the copy could be flagged as AI or if it’s human-written. Then it “identifies patterns and opportunities for humanization.”
The Undetectable AI humanizer then processes the text and aims to make it appear more human-written, considering aspects like readability and what the goal of the text is, e.g. academic vs. marketing.
Some people see the recent AI advancements as an opportunity for positive change, speeding up the research process for creating high-quality content and helping plan articles.
However, some see it as an opportunity to cut corners, passing off AI-generated texts as human-written.
That is why AI writing detection and transparency around AI content are so important, especially as artificial intelligence continues to advance.
Whether people are trying to create content at scale or using the AI paraphrasing tool to pass off AI-generated ideas as their own, an AI detector is vital to ensure that work practices remain ethical and audiences know what they are consuming, whether that be AI or human-written content.
But the question remains: Does Undetectable AI actually get past some of the market-leading AI content detection tools, or does it fall short?
We decided to put the tool to the test by generating content (with ChatGPT) and then running it through Undetectable AI to see what happens, and if it can bypass detection or is still detectable.
To see if Undetectable AI truly holds up to its claims, we set up a controlled experiment and measured performance against three leading detection tools: Originality.ai, Writer, and GPTZero.
Step 1: We began by prompting ChatGPT to produce a brand-new article on the value of brand marketing. This served as our AI-only baseline, the kind of text that detection software should have no issue flagging (screenshot of the ChatGPT-generated text below).
Step 2: That draft was then run through all three detection platforms to capture benchmark scores, giving us a clear picture of how each tool reacts to unedited AI content.
Step 3: Next, we processed the same article using Undetectable AI (screenshot of the Undetectable AI humanized text below), which is designed to transform machine-written text into output that reads more like it was created by a human.
Step 4: Finally, we re-tested the “undetectable” version across all three detection platforms to determine whether the rewritten text could avoid being flagged, or if the systems would still pick it up as AI.
Original content (AI-generated): 100% Confidence that the text is Likely AI
Undetectable AI Humanizer Version: 100% Confidence that the text is Likely AI
Original content (AI-generated): 94% Human-generated (6% AI-generated)
Undetectable AI Humanizer Version: 97% Human-generated (3% AI-generated)
Original content (AI-generated): 100% AI-generated
Undetectable AI Humanizer Version: 91% AI-Generated
As the results show, Undetectable AI had mixed results when tested against leading AI detection platforms.
Originality.ai identified both the ChatGPT draft and the Undetectable AI rewritten version as Likely AI with 100% Confidence.
Writer, by contrast, rated both the original and humanized versions as mostly human, making almost no distinction between them.
GPTZero performed somewhere in the middle. It correctly identified the original ChatGPT text, but detection dropped slightly once the content was processed through Undetectable AI.
In short, Undetectable AI-humanized copy is still detectable as Likely AI by industry-leading platforms like Originality.ai.
Learn more about AI detection:
Undetectable AI allows you to test out the AI tool and its key features for free, but then requires you to purchase a membership once you hit your word limit.
Undetectable AI is a tool that claims to turn your AI-generated text from detectable to undetectable. However, as part of our Undetectable AI review, we found that it is not the case with the industry-leading Originality.ai AI Detector, which identified the Undetectable AI text as Likely AI with 100% Confidence.
The best way to avoid AI detection, and the best practice for producing content, essays, and assignments, is to write authentic and original human-written copy based on your research and with unique insights. If you use AI, do so transparently and as a support, such as for grammar checking, not a replacement for your unique human-written perspective.
According to Crunchbase, Undetectable AI was founded in 2023 and operates with a team of 11–50 employees. As of 2025, according to the Undetectable AI website, the company had rapidly grown to over 18 million users.
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