In this review, we will experiment with a new AI rewriter tool that claims to humanize AI text called Undetectable AI. I recommend you try the rewriter tool before reading this review. It will give you a better understanding of how the automatic writer works. Undetectable AI offers you 250 words to try for free.
Update: February, 2025
I no longer recommend using the Undetectable AI program to humanize AI-generated articles. Over the past two years, they have stopped improving their product, and their recent policy changes have raised concerns.
Specifically, users are losing their paid credits when canceling their subscriptions. In the meantime, hundreds of alternative tools have emerged. I will soon share a better option for automating humanizing AI-generated content.

To use the humanize tool, copy and paste a sample content and click the “humanize” button. Just use the default settings. That’s it! After a few seconds, it will display humanize your AI text on a new window. After examining the improved text, please come back here to read about my findings and see if Undetectable AI is something we can use to enhance your content.
Content Highlights
- Undetectable AI (undetectable.ai) allows you to rewrite human-like AI-generated content that bypasses popular AI detectors.
- The tool uses an advanced algorithm—authorship replication—to rewrite automatically generated text and make it undetectable.
- You can create high-quality, readable content with the help of Undetectable AI.
- It has passed tests on popular detectors like Originality and Turnitin, recording high human scores.
- It is user-friendly.
- Undetectable AI could be a better tool. It has some flaws.
- Take advantage of its free 8-in-1 AI content detection tool.
What is Undetectable AI, and how does it humanize AI text?
Undetectable AI is a user-friendly AI rewriter, rephraser, and AI detector launched in 2023. It is one of the most potent, versatile AI rewriters for humanizing AI-generated content. Undetectable AI CEO Christian Perry claims that his tool allows us to humanize AI content and humanize it, making it read naturally, like human-written writing.
Undetectable AI uses an AI algorithm called authorship replication to rewrite AI text to make it undetectable. It has passed popular AI detectors like Originality and Turnitin, receiving high human scores. We will test the improved version through our articles to see if it can pass the AI detectors as advertised.
Main features of Undetectable.ai—AI-to-human text converter
Readability setting
It has 5 different levels for readability settings. They are being updated constantly, so you may be seeing more options. The readability settings are:
- High School
- University (default)
- Doctorate
- Journalist
- Marketing
The readability levels are self-explanatory. To show you the differences between the readability settings, I’ve created a paragraph using OpenAI’s ChatGPT with a simple prompt without any effort to improve the base text and humanized it using all 5 readability levels.

As you can see from the rewritten texts, each readability level generates slightly different versions using various styles. My favorites are the university and marketing levels.
Purpose setting
Undetectable provides a wide range of settings to choose the purpose of the writing. The purpose options are:
- General Writing
- Essay
- Article
- Marketing Material
- Story
- Cover Letter
- Report
- Business Material
- Legal Material
Human Scale Setting
In addition to the readability and purpose settings, Undetectable AI provides 3 human scale levels: More Readable, Balanced, and More Human. Feel free to try all three options yourself to determine which setting is suitable for your writing style.
8-in-1 AI Content Detector
Undetectable.ai provides an 8-in-1 AI detection tool. It is entirely free. It checks 8 online AI detection tools with the click of a button. It utilizes the following AI detectors using their API:
- GPTZero
- OpenAI
- Writer
- Crossplag
- Copyleaks
- Sapling
- Contentatscale
- ZeroGPT


Some sites charge for this kind of service. Please take advantage of its free tool. It will make your life much easier.
Best settings for Undetectable AI for humanizing AI text that bypasses AI detection
Undetectable AI is still in its infancy. They are constantly updating the tool and adding more options. But for now, there are 135 combinations of readability, purpose, and human-scale settings, which makes it extremely difficult to test them all. Thus, I’ve selected a handful of combinations that performed well for me. Please remember that no matter which combination of settings, the final result passed all 8 AI detectors by default. My experiment is more focused on passing the Originality.ai detector and how well it performs on Originality’s human score and readability score.
Top 5 best-performing settings
The first article is written about a health niche (100% original), and the second article is about a tech niche (89% original).
| Readability | Purpose | Human Scale | Originality Original | Originality Plagiarism | Originality Readability |
|---|---|---|---|---|---|
| University | General | More Human | 100% | 0% | 32.9% |
| University | General | More Human | 89% | 0% | 45.7% |
| University | Article | More Human | 85% | 0% | 42.5% |
| High School | Story | More Human | 80% | 0% | 44.6% |
| Marketing | General | More Human | 80% | 0% | 44.0% |
Worst Performing Settings
| Readability | Purpose | Human Scale | Originality Original | Originality Plagiarism | Originality Readability |
|---|---|---|---|---|---|
| High School | General | Balanced | 46% | 0% | 42.6% |
| University | Story | More Human | 53% | 0% | 44.5% |
| Journalist | General | More Human | 44% | 0% | 42.7% |
| High School | Article | Balanced | 39% | 3% | 39.8% |
| Original | 0% | 4% | 39.8% |
The test results reveal that the default setting performed the best to humanize your article texts for Originality’s human score. Please note that I intentionally used a simple, generic prompt to create the original article. With a better base article generated with proper prompts, the human score and the readability score of Originality.ai will be higher. The higher the Originality human score, the better the chance to bypass AI detection.
Some flaws: Undetectable AI could be better
As I’ve mentioned above, Undetectable.ai is a brand-new tool. No AI tool is perfect. Let’s keep that in mind. A few things that could be improved are:
- Text editor
- Punctuations
You can’t edit or format text on their output screen. They should improve the text editor or at least make it bigger. Also, their output generates several punctuation mistakes, which is typical for AI rewriters. You should always check the grammar and check for punctuation errors using your favorite grammar checker, like Grammarly or WordTune. I personally use Grammarly. It works well for me.
Final thoughts
Undetectable AI allows creators to humanize AI-generated text into top-notch, easily readable content in a wide range of genres. Undetectable AI has got you covered whether you need captivating blog posts, persuasive marketing copy, well-structured essays, or engaging fiction stories. With Undetectable AI, you can harness the potential of AI to rewrite your compelling content without the risk of being identified as machine-generated.
FAQs
What are the core product features of Undetectable AI?
It offers a range of features that make it the ideal tool for converting AI content into human text. The main features are humanizing text, scaling output without AI flags, a user-friendly interface, and its free online AI detection tool. It’s basically a human text converter.
How does Undetectable AI work?
Undetectable AI uses an advanced algorithm called authorship replication to rewrite AI-generated text (generated from ChatGPT or similar text generators) and make it undetectable (human-like text). The tool analyzes patterns in the input text and rewrites it with new combinations of words and sentences to smooth out the mechanical nature of AI-written content.
What types of content can be created with Undetectable AI?
Users can create (by rewriting or rephrasing) high-quality, readable content with Undetectable AI, including blog posts, marketing copy, essays, and stories.
How does Undetectable AI perform on AI detectors?
Undetectable AI’s content has passed tests on popular detectors like Originality and Turnitin, receiving high human scores and bypassing AI detection.
How is Undetectable AI redefining content creation with AI?
Undetectable AI is redefining content creation with AI by allowing creators to generate undetectable content at the click of a button, ensuring that the output is indistinguishable from content created by humans.
Is Undetectable AI currently the most advanced undetectability tool on the market?
Undetectable AI is currently one of the most advanced undetectability tools, offering an easy-to-use interface for beginners and professionals.
What are the benefits of using Undetectable AI?
Content creators can leverage AI for quality content while avoiding the risks of detection.