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Top ChatGPT Plagiarism Checking Tools of 2024

Every day a new AI tool enters the market — but none leaves as big an impact as ChatGPT did. It has become such a dominant force in various fields, especially education. With that, teachers are presented with a new dilemma: "How can you tell if something came from a human or from ChatGPT?" These tools should help
Updated February 26, 2024

For better or worse, AI is here to stay. Even I use ChatGPT and Bard daily to expedite my research or get assistance in coding. There’s no question that AI software like ChatGPT will permanently change certain aspects of our life: education included. We’ve already seen students use ChatGPT to cheat — we can only imagine what future iterations of GPT will bring.

The best we can do for now is mitigate the impact.

We can’t escape change, so we adapt to it. Since AI has become so relevant in our classrooms, we must use the most reliable of detection tools to check if something was plagiarized from ChatGPT.

If you don’t know where to start looking, we can help you with that.

The Best ChatGPT Plagiarism Checkers

We take AI plagiarism checking seriously here at Gold Penguin — that’s why we’ve tested every software listed here. Rest assured that no matter which one you pick from these tools, they will be reliably accurate.

With that out of the way, let’s start with…


Copyleaks is an application that can detect whether a piece of content is AI-generated or not. Not only is it free, it’s also user-friendly and highly-accurate. Apart from having an AI detection tool, Copyleaks also has a traditional plagiarism checker, AI test grader, and AI governance and compliance tool.

Copyleaks Landing Page

So, let’s examine how it fares against content generated by ChatGPT. This is the result of that testing:

Copyleaks Sample Test

Content At Scale

You may have heard of Content At Scale, an AI writing platform designed to make content that ranks. But, did you know that they also offer a free AI detection tool?

Content At Scale Landing Page

Content At Scale claims that it can detect content from ChatGPT, GPT-4, and Bard with 98% accuracy. And, from what I see as I test it against ChatGPT content, it certainly lives up to that promise.

Content At Scale Sample Test

Winston AI

Winston AI boasts one of the highest AI detection accuracy rates in the market with 99.6%. Unfortunately, it’s a premium product, but they do have a free trial for 7 days and 2000 words.

I’d say that Winston’s my favorite ChatGPT plagiarism checking tool in the market because — apart from their accuracy — they also have one of the cleanest UIs. The only downside is that I find Winston to be slower than the other tools that exist.

Originality AI

Originality AI is an AI content detection tool and plagiarism checker in one. As of August 2023, with the release of their version 2.0, the team behind the application posits that it can detect GPT-3 and GPT-4 content with more than 99% accuracy, and ChatGPT content with 89% accuracy. It’s safe to say that it’s one of the best AI detectors in the market today.

Originality AI Landing Page

However, one thing that I don't like about Originality AI is how buggy their Chrome Extension is for free users. I was eager to give it a test but every time I asked it to give me the AI or plagiarism score of a text, I would encounter an error like this:

Originality AI Error

No matter what I did, it’d give me the same error. At some point, I just gave up. Therefore, I’d say that Originality AI is a great tool if you’re a paying customer — but free users might be better off trying a different software.

You can read more about Originality AI here.


If you need something quick and easy, try GPTZero. It’s a free AI detector that could detect which parts of your content are most likely to be written by ChatGPT, GPT-4, or Bard.

GPTZero Sample Test

Some of the features GPTZero offers include:

  • API: Implement GPTZero into your own platform.
  • Chrome Extension: Easily check if a piece of content is generated by an AI.
  • Writing Report: Determine if something is AI-written based on their writing pattern.


Sapling is an awesome tool for any business running on CRMs to supercharge their sales and customer support process. But, apart from that, Sapling AI also offers a free AI detection tool that can detect if you copied text from ChatGPT.

Sapling Landing Page

Sapling AI Detector was created by former developers from Meta and Google. They’re continually improving their software to better detect various AI models. Most recently, Sapling made improvements to their accuracy and text calibration.

Sapling AI Detector Sample Test


Not to be confused with GPTZero — ZeroGPT is a freemium ChatGPT plagiarism checking tool. Some of its features include:

  • Bulk document upload.
  • Highlighting of likely AI content.
  • Support for all languages.
ZeroGPT Sample Test

While ZeroGPT seems to be accurate enough, I wouldn’t recommend using this product if you’re quickly annoyed by ads and popups.


Crossplag is an AI detector that uses a deep understanding of language models to accurately classify texts with 3000 words or less.

Crossplag Sample Test

They offer a free trial but, after that, you must pay for credits to continue using their product. One credit can check 100 words, and each credit costs €9.95.

Gold Penguin

Last but certainly not the least, did you know that we also offer our own AI detector that can check if a text originates from ChatGPT?

Gold Penguin Sample Test

Our detection tool is trained on hundreds of thousands of texts, which lessens the possibility of getting a false positive or a false negative.

TurnItIn: The Elephant in the Room

It shouldn’t come as a surprise to anyone that one of the most prominent users of ChatGPT are students. Academic dishonesty with help from ChatGPT has become such a huge issue within classrooms that there has been an increase in demand from teachers for an accurate AI detector to classify schoolwork — and TurnItIn tried to fill that void.

Well, tried and failed.

There’s no perfect AI detection tool — every tool out there will have its fair share of false positives and false negatives. The thing is, there are students who are learning that the hard way. TurnItIn’s AI detector, in particular, was treated as gospel by some teachers that it jeopardized the future of some students.

Personally, I’d advise teachers to stay clear of TurnItIn for ChatGPT plagiarism checking for now.

What's Next?

Now that we’ve had ChatGPT for almost a year, our understanding of what AI content is and what they look like are better than ever. That’s why any of the tools mentioned above, free or otherwise, can detect ChatGPT content with a high level of accuracy.

However, “high level” does not mean perfect. As mentioned earlier, false positives and false negatives are still a thing. 

So, until we’ve eliminated any possibility of false detection, only use these tools to help confirm a suspicion but don’t build an entire case around their output. It’s always best to exercise your own judgment when it comes to text.

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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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