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Undetectable AI vs. Paraphraser.IO: Which Makes Sense For You?

Undetectable AI is one of, if not the most, popular AI bypassers and paraphrasers in the market. But when you've got a product named "Paraphraser.io," it's a little hard to ignore the implications. In this article, I'll be comparing these two tools and decide, once and for all, which is the better AI paraphraser.
Updated March 12, 2024
Robots fighting using pen, generated with Midjourney
Robots fighting using pen, generated with Midjourney

There’s little to nothing more controversial in generative AI than detection. Some defend it deeply, saying that it’s the last resort against dishonesty by way of ChatGPT and other AI models. Others, even OpenAI themselves, disapprove of this technology. After all, it’s been the source of many false positive cases over the last year.

For some people, paraphrasing tools have been a godsend in fighting against false accusations of using AI. However, since it’s an emerging segment, one too many have popped up in this space, and there’s no guarantee that you’re picking the right one unless you give them a try.

If you don’t have the time nor patience for trial and error, don’t worry! In this article, I’ll be going through two of the most popular paraphrasers in the market today: Undetectable AI and Paraphraser.io. Let’s see which one lives up to their namesake, shall we?

What are Undetectable AI and Paraphraser.IO?

At their cores, Undetectable AI and Paraphraser.IO are, as the latter’s name suggests, tools made to paraphrase text. However, their biggest difference is their use case. 

Undetectable AI is an AI bypass paraphraser that turns machine-generated text into something that resembles human writing. This is possible through rewriting the content and removing certain AI markers that detectors often flag, like repetition, common AI words and sentence structure, and watermarks.

Paraphraser.IO is a much more straightforward tool. Instead of purposefully avoiding AI markers, it focuses on creating a more structurally sound paraphrased version of the original text than Undetectable AI. This, unfortunately, means it’s more likely to be classified as AI by detectors, but we’ll get to that in a minute.

Undetectable AI vs. Paraphraser.IO: Features

Undetectable AI’s biggest feature, besides AI bypassing, is its output customizability. You won’t have to retrofit their output based on your use case; they’ll do it for you. You can pick your preferred readability level (ranges from high school to doctorate and includes marketing or journalism) and its use case (general writing, essay, story, marketing copy, and more).

For $5 monthly, you can also purchase their human typing extension, which lets you simulate human typing behavior on Google Docs.

Moving on to Paraphraser.io, you won’t get many features in this app. What you do get is access to 22 different languages, something that Undetectable AI is yet to offer. You can also switch between three different modes (fluency, standard, and word changer) for free, but you can unlock three more with the paid version (creative, smarter, and shorter).

Undetectable AI vs. Paraphraser.IO: Creativity and Fluency

Original ChatGPT Text

Our planet spins, creating a natural cycle of day and night. But keeping track of time across vast distances gets tricky. Time zones are humanity's solution, dividing the world into regions that share a standard time. Ideally, these zones follow longitude lines, with each 15 degrees representing a one-hour difference.


In reality, borders often trump perfect lines. Countries and regions prioritize consistency within their areas, leading to some zones spanning broader ranges or having unique offsets like 30 minutes. Daylight Saving Time further complicates things, adding an hour during summer months in some areas. Despite the patchwork, time zones keep our world coordinated, ensuring a shared understanding of  when that important meeting starts or that birthday message arrives.

Undetectable AI

Rephrase.info

The Earth rotates, causing the cycle of day and night. However coordinating time across distances poses a challenge. Time zones were introduced by humans to standardize time across regions. Ideally these zones align with lines, where each 15 degree increment equals one hour.


In reality national borders often influence time zone boundaries. Countries prioritize consistency within their territories resulting in some zones covering areas or having offsets, like 30 minutes. Daylight Saving Time further complicates matters by adding a hour during summer in regions. Despite the variations time zones play a role, in synchronizing our world. Ensuring everyone knows when that important meeting begins or when a birthday message will arrive.

Our planet rotates, creating a natural  day and night cycle. But keeping track of time over large distances becomes difficult. Time zones are humanity's solution, dividing the world into regions that share a common standard time. Ideally, these zones follow lines of longitude, with each 15 degrees representing a difference of one hour. 


In reality, boundaries often overwhelm perfect lines. Countries and regions prioritize consistency within their regions, causing some regions to have wider ranges or  unique time offsets such as 30 minutes. Daylight saving time further complicates matters, adding an extra hour during the summer months in some areas. Despite the differences, time zones keep our world coordinated, ensuring a common understanding of when that important meeting starts or birthday message arrives.

Let’s start with something simple: grammar issues. What you’ll notice when reading about Undetectable AI’s output is its punctuation and grammar mistakes. No, this wasn’t an error on my part — instead, Undetectable AI purposefully hides AI text behind these mistakes. It does mask AI writing, but it also messes up the fluency of the original text.

On the other hand, Paraphraser did not have any grammar or punctuation errors at all. However, it does lack an understanding of the source material. For example, the original text uses “conductor’s baton” as a simile for the meticulousness of artists. By losing the word “conductor” and without any reference to music, the simile loses all its meaning and the phrase “like a baton” just stands out like a sore thumb.

The truth of the matter is that I can’t pick one of these tools for creative and fluent writing. They both have specific flaws that I simply can’t ignore. If you’re looking for some

And one more thing, although this is admittedly a personal pet peeve. I haven’t messed around the formatting of these, so what you see above is how each tool outputs their texts. I’m not a big fan of Paraphraser.io messing around with the structure of the paragraph by dividing it by sentence. But as I said, it’s a personal preference.

Undetectable AI vs. Paraphraser.IO: AI Bypassing

Test #1

Undetectable AI: Passes as human!
AI Likelihood Score: 0%

Paraphraser.io: Detected as AI.
AI Likelihood Score: 79.7%

Test #2

Undetectable AI: Passes as human!
AI Likelihood Score: 0%

Paraphraser.io: Detected as AI.
AI Likelihood Score: 100%

Test #3

Undetectable AI: Detected as AI.
AI Likelihood Score: 100%

Paraphraser.io: Detected as AI.
AI Likelihood Score: 90.2%

Test #4

Undetectable AI: Passes as human!
AI Likelihood Score: 0.5%

Paraphraser.io: Detected as AI.
AI Likelihood Score: 99.9%

Test #5

Undetectable AI: Passes as human!
AI Likelihood Score: 0%

Paraphraser.io: Passes as human!
AI Likelihood Score: 0%

Final Scores

Test Number

Undetectable AI

Scribbr

Test #1

0%

79.7%

Test #2

0%

100%

Test #3

100%

90.2%

Test #4

0.5%

99.9%

Test #5

0%

0%

Average AI Likelihood

20.1%

73.96%

Undetectable AI vs. Paraphraser.IO: Pricing

The cost of Undetectable AI depends on two factors: your monthly word count needs and your preferred payment option.

The price for monthly payments starts at $9.99 per month for 10,000 words and increases to $209 per month for 380,000 words. If you opt for an annual plan, the cost is significantly lower, ranging from $5 per month for 10,000 words to $104.42 per month for 380,000 words.

Paraphraser.io already has a robust free version. However, if you want to get the additional paraphrasing modes, you have to purchase their premium plan for $7 per week, $20 per month, or $12.5 per month ($150 for the whole year) if you want to pay annually.

The Bottom Line

This is one of the easiest comparison articles I’ve had to make because there is a clear answer. So, here it is:

Do I recommend giving Paraphraser.io a shot? Since it’s mostly free, absolutely. But do I recommend using Paraphraser.io as a daily driver? Not at all. 

The bottom line is that Undetectable AI has an excuse for having subpar grammar accuracy and creativity. After all, it’s an AI bypass tool first and a paraphraser second. Paraphraser.io isn’t. The fact that it can’t avoid AI detection while having creativity and fluency issues does not make it worthy of its name.

If there’s one edge that Paraphraser.io has over Undetectable AI, it’s the price. However, if you want something that won’t break the bank, it’s better to just use QuillBot’s free paraphrasing tool by breaking down your text into smaller parts and stitching them back together like a jigsaw puzzle.

So, that about does it for this comparison article. While I have you here, might I suggest reading more about Undetectable AI in one of our many articles such as this one? Otherwise, choose wisely, and good luck paraphrasing!

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Written by John Angelo Yap
Hi, I'm Angelo. I'm currently an undergraduate student studying Software Engineering. Now, you might be wondering, what is a computer science student doing writing for Gold Penguin? I took up studying computer science because it was practical and because I was good at it. But, if I had the chance, I'd be writing for a career. Building worlds and adjectivizing nouns for no other reason other than they sound good. And that's why I'm here.
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