I put the Surfer’s AI 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.
👉 Find the official best AI humanizers list here.
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How to Use It
It’s very simple to get started with Surfer, enter their website.
Surfer is a platform focused on SEO, and the AI Humanizer is only one of its many features. You can test it out for free, with a limited word count.
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.
Let’s get to the results. This is the text number 1:
Here, I scanned the humanized output with an AI detector, which provides an AI probability score. After humanizing, the text sample still scored 99% likelihood of being AI-generated. Surfer also rates the humanized text, and in this case, it gave it a 0% human score.
Next, the text number 2:
Not very convincing so far. Let’s try text number 3 next:
This was the only one that received a decent score, and would maybe pass as human-generated. I hit the word limit because only around 280 words were generated from my longest, 500-word text sample.
Pros
- Easy to use, no need to sign up to use AI Humanizer
- Many other features in addition to AI Humanizer, especially for SEO
Cons
- Limited words with the free trial
- 2/3 samples got flagged as 99 % likelihood of being AI-generated after humanizing
Pricing
Here are the pricing plans Surfer currently offers. It’s mainly designed for content creators, SEO writers, marketers, and small business owners who want to improve their Google ranking.
In Summary
Surfer SEO combines AI insights with practical SEO tools to help you create content that’s not only readable but also competitive in search rankings.
I tested the free version of their AI Humanizer, and unfortunately, the results weren’t that great. Only one of my text samples received a human score of 50%, while the others were flagged as 99% likelihood of being AI-generated. Also, the free plan comes with a quite strict word limit and doesn’t include any additional features, like style or mode settings.
Surfer is a great tool if you belong in the target customer group, but for only the AI Humanizer, I can’t recommend it.
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.