By Valentina Izzo

10 months ago

Find out which are the best plagiarism checkers for AI-generated content and how you can use them to check content authenticity.

Table of contents:

The rapid proliferation of AI-generated content, especially since the recent introduction of ChatGPT in November, has underscored the importance of verifying the authenticity of digital content. This verification is crucial for companies and other institutions to determine whether a piece of content was created by a human or with the assistance of AI tools. Furthermore, digital marketers and SEO professionals must ensure that Google accurately indexes a website’s content, maintaining its visibility and relevance in search results.

In response to these challenges, a variety of tools have emerged, designed to detect AI-generated content and check for plagiarism. These tools serve as essential resources for safeguarding the integrity of digital content and protecting intellectual property rights. In this article, we will introduce you to some of these pivotal tools, offering insights into their capabilities and applications.

We continuously strive to keep this list up to date, reflecting the latest developments and additions in detecting AI content and plagiarism. However, we recommend exercising the utmost care when utilizing these tools. It’s essential to critically assess their effectiveness and consider expert opinions on their application and impact.

Recent academic research, such as the paper available here, along with viewpoints from experts like Jen Persson (@TheABB), Timnit Gebru (@timnitGebru), and Gabriella Sannino (@SEOcopy), further emphasize the significance of these tools. Their insights contribute to a deeper understanding of the challenges and opportunities presented by AI-generated content, guiding the development of more effective strategies and tools for content verification.

As we navigate the evolving landscape of digital content creation, the role of AI detection and plagiarism checkers becomes increasingly vital. By staying informed and leveraging these tools judiciously, we can ensure the authenticity, credibility, and success of our digital content strategies.

How To Detect AI-Generated Content?

There are several ways to recognize AI-generated content. One common method is to use software that analyzes various features of the text, such as the use of a particular language, a particular formatting or structure, and the repetition of certain keywords.

Large language models (LLMs) can also be used to detect AI-generated text. One of the most successful ways to do this is to retrain the model on some texts written by humans, and other machine-generated text so that it learns to distinguish between the two, says Muhammad Abdul-Mageed, researcher in Natural Language Processing and Machine Learning at the College of British Columbia.

Online AI Plagiarism Checkers

There are a number of tools that promise to detect AI-generated content. Most of these tools are based on GPT-2 or GPT-3. While the first is a compressed model trained with a limited amount of data and works well with English but not with other languages, the second is currently the largest and most powerful model, which is also used for ChatGPT and is multilingual.

Here is a short list with the best plagiarism checkers for AI-generated content.


GPTRadar is one of the best tools for detecting AI. It is based on GPT-3 Davinci that can detect whether the content was written by a human or a machine by analyzing text and performing certain calculations on metrics like perplexity and burstiness.

The former indicates the degree of confidence with which the model generates the next words , while the latter is how perplexity changes over every sentence to identify common patterns. The result contains a percentage for accuracy, which indicates the degree of confidence of the model with respect to the result.

The feedback loop allows the GPTRadar team to constantly improve the model used for AI recognition and thus the result for the user. The tool costs $0.02 per credit (1 credit = 100 tokens ≈ 125 words), and API is also available.


Originally.AI is a plagiarism checker and AI detector that is able to determine if the scanned text was written with an AI tool. It was developed by a team of content marketing and GPT-3 experts for web publishers, content agencies and website buyers. It allows them to search for plagiarism cases, monitor the team’s activities, and check if not just one page, but the content of an entire website is original (this feature is coming soon). It can also detect content written with ChatGPT and GPT 3.5 (DaVinci-003) with the same accuracy as GPT-3.

It also provides APIs to integrate AI detection into the content creation workflow or into a custom tool. Pricing starts at $0.01 per credit, 1 credit scans 100 words.


GPTZero uses the same technology that was used to develop ChatGPT, with the opposite goal of detecting whether content was written with AI. 
The tool is under constant development. As stated on the website, the GPTZero team is working on building a special solution for educators that can help them use AI technologies responsibly. The classic version is currently free (and probably will be in the future).

AI Detector Pro

AI Detector Pro is a tool to detect whether a piece of content has been AI-generated.
Its algorithm, trained based on GPT-3, GPT-4, and Bard, can show the probability that content was created using AI. It provides a detailed report, which indicates the confidence level that it is AI-generated content, whether the content was copied and pasted from the web, and what the source URL is, and highlights which sentences are most likely to have been generated with AI.
It also includes 30 additional tools. The price varies depending on the plan you choose and the number of features included (including the number of reports you can do monthly): from the free plan that provides only three reports to the unlimited plan that costs less than $50 per month.


GPTKit is a free AI text generation detection tool. It uses 6 different AI-based content detection techniques, resulting in higher accuracy.

It was developed by training a custom model with over 1 million datasets. The dataset includes ChatGPT-generated and human-written texts from various sources (50/50). These sources include old news articles, Wikipedia pages, comments on Reddit, etc. The model has an accuracy of about 98%, based on testing on a 0.1 million test dataset.

The results including a report on the authenticity or reality rate of the content, are then displayed to help users achieve good and accurate results.


Turnitin is designed for the Academia (students, instructors, publishers and researchers). It ensures the originality of students’ work by exposing even the most sophisticated incorrectness and helping them develop new ideas; and it provides teachers with simple procedures for evaluating the material produced and secure digital exams taken offline. It also ensures integrity and academic excellence for publishers and researchers with its feedback and insights

The price varies depending on the product you choose and the category it belongs to. To find out, you should contact the sales team.


CopyLeaks developed its AI Content Detector with the goal of giving users a tool that can detect whether content was written with AI with 99.12 percent accuracy. Even those created with ChatGPT. This tool can be used:

  • In SEO, to protect yourself from Google penalties.
  • in Academia, to ensure the integrity and veracity of content written by students and reviewed by professors.
  • in publishing, to ensure the originality of books and articles.
  • in reviews, to prevent false and potentially harmful reviews on websites.

It also provides integration with API and LMS platform. You can use it online by uploading and scanning text, or you can download the free Google Chrome extension that lets you check social media posts and news articles on your favorite sites.

CopyLeaks’ monthly or annual cost depends on the number of pages to be detected. Prices start at $10.99 per month for 100 pages and range up to a customized plan for large sites.


ZeroGPT is a free and reliable tool to detect AI plagiarism, like text written by ChatGPT, Google BARD or any other AI chat bot. ZeroGPT uses the DeepAnalyse™ Technology, an advanced and accurate technology to detect the origin of any text in depth. Nowadays, ZeroGPT is adopted by many educational and professional institutions.

Winston AI

Winston AI is a powerful AI content detection solution built for publishing and education. The software analyzes a piece of content and recognizes with 94% accuracy whether the text was created by an artificial intelligence or a human. It can also detect if the text was written using ChatGPT and also provides plagiarism detection.

This tool is intended for those who work in education, marketing and content creation.

You can create a free Winston AI account (no credit card required) and analyze 2,000 words. After the free trial period expires, you can choose a plan that best suits your needs, starting from $14 per month.

SciSpace Academic AI Detector

SciSpace Academy AI Detector can identify content written by humans and artificial intelligence in scientific literature, ensuring that the academic authenticity of the content is maintained. It is able to detect AI-generated text in various content such as blogs, essays, assignments and research papers with an accuracy rate of 98%. it is also possible to upload a pdf file and analyse it for authenticity. The tool is able to detect content produced with GPT-4, ChatGPT, Jasper, and other AI writers’ presence in scholarly content.

You can create an account for free.

Editpad AI Detector

The AI Detector by Editpad is a reliable tool for detecting AI plagiarism in write-ups. It can detect GPT-3, GPT-4, and Gemini, among others, in an instant. 

No account or sign-up is needed to use the tool, meaning it’s quite user-friendly. Another good thing is that the tool is constantly updated with new algorithms, making it better and better at catching AI. There is no input limit as well, making it a good option for those who are looking to check AI plagiarism in lengthy texts. 

It is capable of detecting AI in five different languages. i.e. English, French, German, Spanish, and Portuguese.

Other Frequently Asked Questions

Does Google penalize AI content?

With the Helpful Content Update, Google confirms its aversion to AI-generated content and its intention to avoid the proliferation of low-quality text written for search engines, not for people.

There is a way to make a difference and create AI-generated content of high quality without risking a penalty from Google (and users). The answer is simple: data. As Kevin Indig said: “The biggest differentiator will be what inputs (data) companies can use to create content”. And that’s where structured data comes in.

Is AI content good for SEO?

When it comes to AI-generated content for SEO, there is no absolute good or bad. To create tangible and sustainable business value, you need to create workflows where humans collaborate with machines. This means using language models like GPT-3 while maintaining control over content quality and semantic accuracy. Within this workflow, humans have the main task of nurturing semantically rich data in Knowledge Graphs. This is the only way to create content faster, support the work of the editorial team, and scale SEO.

In WordLift, we have developed a sophisticated approach to AI-generated content, from initial data collection and enrichment to active learning where the model is improved and the validation pipeline is also improved.

To find out how you can build intelligent workflows that leverage NLG for your business and scale SEO, watch the webinar👇

How can I avoid plagiarism in my content?

Plagiarism can have serious consequences, so it’s important to ensure the originality of your content. One effective solution is to use a trustworthy paraphrasing tool such as This online tool uses advanced algorithms based on Artificial Intelligence (AI) and Natural Language Processing (NLP) to rewrite text while preserving its original meaning. It provides various writing modes, such as Basic, Elegant, Productive, It is compatible with all operating systems and devices, supports multiple languages. If you need assistance or have any questions, the tool provides 24/7 customer support via the chat box.

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