I put Undetectable AI Text Humanizer to a test with three AI-generated text samples.
In this post, I’ll test and give an overall review of the tool, and show the results. In my reviews, I emphasize the ease of use, and will only test free tools or tools with Free trials.
Disclaimer: This post has affiliate links at no cost to you.
How to Use It
Using Undetectable AI is very simple and easy, just enter their website and you land on the AI Humanizer directly.
With the free version, you can humanize up to 1000 words.
My Results
I asked ChatGPT to generate three different text samples on random topics; you can find them at the end of this post. Then, I humanized the texts using Humanize AI and ran a separate AI detection scan on Undetectable AI to see their AI scores after humanizing.
Interestingly, the two tools have the same name, but they are in fact separate providers.
Let’s see how Undetectable AI performed. Here is the humanized output of the first text sample.
And then I ran the AI Detection scan to see how the humanized text turned out. Sentences highlighted in red are likely AI-content.
It scored a 75% likelihood of being AI-generated. Not a good result, but I’ll give it that the text is very short, and it’s a lot harder for AI to detect shorter pieces accurately.
Here are the results from the second text sample.
The AI score improved slightly from the first text, but still not accetable.
And finally, the last text sample.
So it seems like the AI score improved in correlation with length. In conclusion, none of my texts passed as human-generated content, but humanization had some effect on the AI score.
After three scans I had 204 free words left.
Pros
- Easy to use
- Very simple UI
Cons
- Limited words with the free version, can only do a few generations
- 0/3 of my texts passed as human-generated content
Pricing
Here are the pricing plans of Undetectable AI.
In Summary
Undetectable AI is an AI-powered humanizer tool that detects phrasing, structures, or wording frequently used by AI technologies and rewrites them to resemble human-generated content. Despite its name, it’s a separate tool from the platform called Undetectable.ai.
I tested the free version of the AI Humanizer with my AI-generated text samples. After humanizing, all of them still got flagged as AI-generated content. However, there was some improvement, which seemed to correlate with the length of the text. My longest text sample was flagged at around a 60% likelihood of being AI-generated, so the humanization did have some effect. Maybe with a bit of manual editing on top, it could pass as human-generated.
Their website is user-friendly, and the AI Humanizer tool is very easy to access. You can humanize up to 1000 words with the free trial.
To Take Home
AI humanizers try to make AI-generated text sound more “human” by tweaking phrasing structure and tone. Some even promise refunds if your text gets flagged as AI.
Honestly, these tools aren’t very reliable and don’t really add much value. If you must use content generated by ChatGPT, it’s much better to edit and polish it yourself than try to trick a detection system.
My test text samples
Here are the text samples I used. The samples are generated 100 % by ChatGPT. The samples are different topics and lengths, varying from 150 words up to 500 words.
Text sample 1 — 150 Words
Houseplants do more than decorate our homes; they quietly transform the air we breathe and the way we feel. A touch of green can soften even the most sterile apartment, making it feel alive and personal. Caring for plants teaches patience — you can’t rush a seed to sprout or a leaf to unfurl. Each morning, a small routine of watering or pruning becomes a mindful pause in the day. The scent of soil, the sight of new growth, and even the occasional wilted leaf remind us that everything thrives through attention and consistency. Beyond aesthetics, studies show that plants reduce stress and improve concentration, making them tiny guardians of both mood and productivity. In a world full of screens and noise, a simple pothos on a windowsill offers a quiet, grounding reminder of nature’s calm persistence.
Text sample 2 — 300 Words
Coffee is more than a beverage — it’s a ritual, a global language spoken in mugs and espresso cups. From the bustling cafés of Rome to the quiet drip brewers of Japan, coffee culture reflects both tradition and innovation. Each region adds its own personality: Italians linger over a quick espresso, Scandinavians sip black filter coffee, and Australians have perfected the smooth, creamy flat white.
What makes coffee special isn’t just caffeine; it’s connection. We meet friends “for coffee,” brainstorm over it, and pause mid-morning to refocus. The familiar aroma signals comfort and productivity all at once. Even in solitude, brewing coffee feels communal — millions of people perform the same act every day, in different corners of the world.
Beyond its social role, coffee is a science of flavor. Roast profiles, grind size, and water temperature determine whether a cup tastes rich and nutty or sharp and citrusy. Specialty roasters and baristas treat it as an art form, crafting drinks that highlight subtle notes like chocolate, berries, or flowers. The modern coffee movement has revived appreciation for the farmers and regions behind each bean, encouraging sustainability and fair trade.
Ultimately, coffee unites people not just through shared taste, but through shared time — a few quiet minutes in an otherwise restless day.
Text sample 3 — 500 Words
IFor centuries, humans have looked up at the night sky in wonder. Before city lights and technology, the stars were our calendar, our map, and our mythology. Even today, when satellites and telescopes have revealed much about the universe, the act of stargazing still feels deeply human — a bridge between curiosity and peace.
The beauty of the night sky lies in both its mystery and familiarity. We recognize constellations that our ancestors once named, from Orion’s Belt to the Big Dipper. These patterns remind us that across cultures and millennia, people have shared the same view above. It’s humbling to realize that the light we see from some stars began traveling toward us millions of years ago. In every small point of light lies the story of time itself.
Modern astronomy has only deepened that wonder. With even a small telescope, anyone can see Jupiter’s moons, Saturn’s rings, or the soft glow of distant galaxies. Yet, what moves us most isn’t the data or the science — it’s the feeling. Standing under a clear night sky, we sense both our insignificance and our connection to everything.
Stargazing also offers rare quiet in a busy world. When you turn off your phone and let your eyes adjust to the dark, your thoughts begin to slow. You notice the rhythm of your breathing, the coolness of the air, the vastness of space stretching above you. It’s meditation through observation.
Whether you’re in a remote field or leaning over a balcony in the city, looking at the stars is a reminder of perspective. Our daily worries — emails, deadlines, arguments — shrink beneath the cosmic scale. The stars remind us that time is immense, yet every moment we experience under them is uniquely ours.