13 AI Content Detector Tools (Free & Paid) I Recommend You Check Out – and Why

In the last few years, and especially since the recent emergence of ChatGPT, numerous AI platforms have hit the market. Although previous SaaS products weren’t as sophisticated, these new AI-generated platforms rely on machine learning and predictive analysis for various tasks. Companies are using them to simplify their marketing processes, including competitive analysis, search and social media optimization, budgeting, and much more.

It was only a matter of time until the need arose to have a tool to detect whether AI was used to create content, and thus: the AI content detector tool was born.

One of the ways in which businesses have been increasingly using AI tools is developing AI-generated content for their marketing campaigns. Generative AI programs can produce a variety of textual and even visual content. Something that previously took content marketers hours and hours to finish, an AI writing platform can do in mere minutes and make it appear as though it is human-written content rather than AI-generated text.

That being said, not everyone is receptive to this new technology. AI-written content carries several risks, including low readability and unnatural language usage. This is why companies are increasingly using AI detection tools as content checkers to ensure none of the content on their sites, regardless if it is sourced internally or externally, is made by automatic AI content generators and is thus truly human content.

What is an AI Content Detector Tool?

Let’s first define what exactly an AI detection tool is and what it does.

As the name implies, an artificial intelligence detection tool can help determine if a post is AI-generated content or content from a human writer. These platforms rely on a combination of natural language processing and sophisticated algorithms based on machine learning, and often will return an AI percentage score as a result. The higher the score, the more likely the text was made by generative AI tools.

Today, the majority of software creators rely on ChatGPT technology for their AI-generated text tools. ChatGPT’s advanced language generation model can help create almost all forms of content, most of which are hard to differentiate from the human-written text. That is why even OpenAI, the developers of ChatGPT, are developing tools to detect AI-generated text as well with more sophisticated detection models.

Why Are AI Content Detector Tools Important in Marketing?

As mentioned, the use of these Generative AI tools can cause several major issues for your business. These may include:

• Dishonesty among content creators and marketing teams. If you are investing a lot of your budget with external agencies for content creation, you want to be certain these articles were indeed written by humans. An AI content detection tool performs a similar task as CopyScape and other plagiarism detectors, ensuring all content pieces on your site are of the highest possible quality.
• AI detectors can even work in the case of false positives. Given that these programs track robotic texts, they can help you establish if an article suffers from poor readability. This can help writers improve their pieces and writing process, thus increasing user engagement.
• According to John Mueller, Google’s Senior Search Analyst, the company’s search engine algorithms often perceive machine-generated text as spam. So, overusing artificial intelligence tools can even lead to Google penalties, hurting your site’s SEO. Again: even if false positives are present, an AI writing detector can help improve processes.

While using content generators is a tempting proposal, it’s not always the best choice. At this point in time, using 100% AI-written content carries too many risks to be considered a good solution. Despite its low price, it’s much safer to go with tried and tested methodology and rely on your writers to deliver original content that has gone through the standard writing process.

While there are many scenarios, such as content ideation, for which AI is an excellent tool for writers, companies have the right to know and decide whether they want to utilize AI-written content. The AI detection tool thus becomes a critical part of quality assurance for marketing operations in addition to standard plagiarism checkers.

Further Reading: Can Google Detect AI Content? Here’s What We Know, and Why It’s Important

How Do AI Content Detectors Work?

An AI content detection tool works much in the same way as an AI content generator does: by taking the patterns of human writing, learning from them, and applying that knowledge to text. Rather than creating text, however, a content detection tool will determine how likely it is that lines of text were written by a human versus a content generator.

There are three important ways that content detectors evaluate text: via tone, syntax, and predictability. One of the most common criticisms of AI-generated content is the sometimes-monotonous tone that can come about with machine-created text. Original content developed by a human writer will have far more variation in tone.

Syntax is another easy predictor of AI-generated content. Machine learning via Natural Language Processing (NLP) is useful in the way it teaches a machine to “talk,” but is problematic in its predictability regarding sentence structure. When sentence syntax has low variability, detectors often flag for AI content.

Predictability can mean the predictability of sentence structure, or the predictability of language use. Machine learning works by assuming the most likely outcome of a sentence or concept. Human writing is far more nuanced, and is more likely to have variation in sentence patterns and word usage. Detailed reports can somewhat reliably determine what is likely machine content and human content.

The 13 Best AI Detection Tools I Recommend

Similar to AI text generators, the detector tool market is still in its inception. Different tools have different accuracy rates, with some of them being much more restrictive than others. Still, based on my personal experience, these are some of the platforms that can yield the best results for your business.

I highly recommend you compare the results on your own and understand that these platforms are all quickly trying to adapt, and thus I am finding that modifications to how these tools run are quite frequent–with the goal to improve the level of accuracy available to identify AI-generated writing.

Many of these AI detection tools also feature additional functionality, so be sure to read each product description for the details!

1. Originality.ai

Originality AI is one of the best platforms on the internet for detecting AI-written text. The software detects GPT-3, GPT-4, and Chat GPT, with an amazing 98% GPT-4 detection accuracy rate. In other words, if a tool detects AI, you can be almost certain that your writers used a generator during the content creation process.

Aside from serving as an artificial intelligence checker, Originality AI also helps act as a traditional plagiarism checker to ID potential plagiarism. This feature is fantastic to ensure there isn’t any duplicate content on your site. If we also consider its readability scoring, you can always be sure your articles are original, well-written, and can achieve high engagement.

2. Copyleaks

Like any other content detector tool on this list, Copyleaks can analyze various types of content. In terms of accuracy score, the tool provides a whopping 99.1% rate. But the most impressive feature is its risk governance, which can detect copyright infringement for any piece of writing–something that even human-like text is not immune from.

You can try the basic functionality at any time, for free, and there’s also a Chrome extension that can simplify your daily tasks. The paid version supports 12 languages and is significantly faster than its free counterpart. The paid version also removes the detection limit per document.

3. Winston AI

Winston AI is an excellent platform that allows you to simultaneously check articles for plagiarism and AI-written text. You can copy-paste text directly or import it in the form of a .docx, .png, .jpf, or .pdf file. The unique thing about Winston AI is that it can “read” text on images and process it.

The platform is fantastic for marketing teams that want to automate their content checking from a single dashboard. Furthermore, you can export the data in the form of reports, which makes collaboration much easier.

Further Reading: 17 AI SEO Software Tools to Help Your Content Rank

4. GPTZero

An interesting thing about GPTZero is that it gives you insights into how different natural language processing techniques work. You can use this free software for content generation based on GPT4, GPT3, Bard, and Chat GPT language model. That way, it’s easier to understand how your articles should look like and what kind of expressions to avoid.

Of course, the main reason people use GPTZero is to detect AI-assisted content. You can copy-paste texts or import them directly from your computer. Unfortunately, like most free tools, GPTZero comes with a major restriction as it has a 5,000-character limit. Furthermore, we don’t know much about its accuracy rate and whether it can do a good job.

5. ZeroGPT

ZeroGPT is another simple, free-to-use platform that works for short and long articles. The program is web-based, so all you need to do is copy your text into the field. After a few seconds, the algorithm will mark all sentences and paragraphs that are likely AI-generated.

ZeroGPT utilizes a proprietary technology called DeepAnalyse that has 98% accuracy. Like other checkers, it supports various languages but works best for English. Based on what I’ve seen after using it for a while, ZeroGPT doesn’t impose any limitations and is a fairly accurate AI detector.

Further Reading: 9 AI Image Detection Tools for When You are in Doubt!

6. Writer AI Content Detector

If you have a large marketing brand, you should definitely consider adding the Writer platform to your toolbox. In this particular case, I’ll focus on the features that can help your marketing content.

Writer’s AI content detector is a small, free tool that you can use with certain limitations. It allows you to check up to 1,500 characters of potentially fake content. The software has limited functionality for AI-generated content detection, and it’s hard to tell whether its scores are accurate enough. Based on what I’ve seen, it’s not as strict as some other platforms.

7. Crossplag

The thing that separates Crossplag is its translation plagiarism detection feature. The platform supports more than 100 languages, helping you determine if a piece was directly translated from foreign sources. Of course, the detection software also works for English, providing a precise score for your online content.

Besides helping with AI-generated content, Crossplag also protects your intellectual property. This fantastic platform safeguards all your sensitive documents and other content by ensuring no one has republished them online.

Further Reading: The 15 Best Free SEO Tools You Need to Know in 2025

8. Sapling.AI

The thing you’ll quickly notice with Sapling.AI is that this checker is much more complex than some of its web counterparts. After analyzing a text, the tool will mark all the sections that are potentially AI-generated. Below that, there’s a further breakdown of suspicious sentences. That being said, Sapling.AI provides better insights than some other checkers that may only boast a high positive rate.

It’s worth noting that this is a paid tool, while free users can check up to 2,000 characters of text. A nice thing about the platform is that it offers several integrations, and you can add it to Google Docs and MS Word to help identify Ai versus human-generated content.

9. GLTR

GLTR stands for Giant Language model Test Room and is one of the older AI online checkers. The platform was made in 2019 by a team of Harvard NLP and MIT-IBM Watson AI lab experts. Unfortunately, its detection model is somewhat outdated, as it only works for GPT-2.

Although it doesn’t offer much in terms of functionality or complete accuracy, especially when compared to some newer software, GLTR is completely free to use. The GPT-2 output detector allows marketers and content creators to check their pieces against a variety of sources.

Further Reading: 8 Best Ways How to Detect AI Generated Content

10. Hive’s AI Detection Tools

Marketers can use this platform to detect AI-generated content within images and texts. When it comes to text, the checker allows you to analyze posts that are between 750 and 8,192 characters long. However, the software works best for texts that are longer than 1,500 characters.

Unlike some other platforms, Hive doesn’t necessarily show if a text was made by humans or AI. Instead, it gives the percentage chance that certain sections are made by AI. In other words, it’s harder to tell if a text was made by tools, but there’s much more segmentation.

11. Quillbot

Quillbot is among the more thorough checkers available, as it sorts human-written and AI-generated content separately and via mixed content, tallying scores according to full AI use, no AI use, and AI enhancement. Although Quillbot is billed as a multi-use tool, it does have a slight bend toward academic pursuits, as its additional features include a citation generator, plagiarism checker, and paraphraser.

Quillbot is an online tool, so users need only copy-paste the text in question into the box provided online, and receive reports for English, German, Spanish, and French. Users can also upload a document to check it for AI content versus human-generated content. The tool is free, and is easy to use.

Further Reading: 25 Useful Content Marketing Tools for All of Your Content Needs

12. Hugging Face

Hugging Face is a large machine learning platform most commonly used by IT experts. However, it also has a few nifty tools geared toward marketers.

Its AI checker provides solid results for texts of any length. After copy-pasting your article in the box, the online program automatically generates results at the bottom. It can predict with high certainty if a piece is real or fake.

13. Smodin

Smodin is billed specifically as a ChaptGPT checker, though it is able to detect other types of AI content. Categorizing results simply, as either human-generated content or AI-generated content in two percentages makes using Smodin simple and straightforward. The tool boasts about 90% for its accuracy rating (99% for identifying human writing), and is a great option for anyone looking for a simple and straightforward tool to use online.

Smodin is also a great option for anyone needing a more robust number of languages for AI detection. Smodin offers detection in over 40 languages, and also offers summarizer tools and plagiarism checkers.

Further Reading: 15 Best AI Social Media Post Generators to Check Out

Features to Look for in an AI Content Detector

It can be tempting to simply opt for the most popular tool, but as I demonstrated above, different tools have different features to appeal to a range of demographics and users. When choosing your assistive tools for AI detection, consider taking a close look at the following essential features, and how they might interact with your goals. These features include:

• Detection accuracy. Although accuracy varies among detection tools, opting for an accuracy rating of 90% or higher is a great starting place. From there, you can move onto whether a tool offers a detailed analysis or a simple one, and how your goals may require a more or less advanced suite of tools.
• Multi-language support. Some AI detectors focus on the English language, while others delve into far more languages, from four to over 40. If you have a larger company, or you are working with content in a number of languages, make sure you select a tool that can accommodate different languages.
• Ease of use and user interface. Ultimately, the best tool is going to be one that you actually use. Tools that are complicated, confusing to use, or with a complicated user interface may perform a host of tasks, but will be too cumbersome to use. Select a tool that aligns with your aesthetic and functional preferences.
• Integration with other tools (e.g., plagiarism checkers or CMS platforms). For some, an AI detector alone is enough. For others, integrations are important, and selecting a tool with additional features is vital. As you go over the different options available, determine how often you use tools like plagiarism checkers and optimization analyses, and find a tool that can seamlessly blend these tasks together.
• Pricing and accessibility. Finally, consider how accessible each tool is. Many of the tools are free, while some offer additional features or tasks for a fee. If you are new to your detection journey, consider first utilizing a free service and upgrading as your needs increase.

Further Reading: Does Google Penalize AI Content? Here’s What We Know

Conclusion

Given the sudden rise of AI generators, marketers should equip themselves with reliable AI content detector tools to ensure that their content is truly human-created and original. In the end, this is the only way to avoid issues that automatically generated content brings. AI detectors are especially vital for agencies that work with numerous freelance content writers and have to analyze volumes of content all the time, but they can also be used by writers themselves to help improve their writing on any given piece of content with the proper training.

Most of the tools on this list are free or come with a free trial. However, if you wish to use an AI content detection checker on a permanent basis because of the popularity of AI-created content, I suggest that you subscribe to one of the more popular platforms.