Best AI Content Detector

My site is 100% reader-supported. If you purchase anything using my affiliate links, I might earn a small commission at no extra cost to you. Just some ☕ coffee money that allows me to continue doing what I love ☺️

If you have no time to read the whole article, here are my top 3 picks for the best AI content detectors.

Best Paid AI Content Detector for Web Publishers
originality ai logo
Originality.AI is an AI-detection and plagiarism checker tool targeted toward serious content publishers.
Try Originality.AI
Best Originality AI Alternative
winston ai logo
Winston AI
The up-and-coming AI content detector that might dethrone Originality AI.
Try Winston.AI
Best Free AI Content Detector
content at scale logo
Content at Scale
Content at Scale is one of the new guys on the block offering an excellent 100% free AI detector.
Try Content at Scale

With the rise of artificial intelligence and its use in content creation, it’s no surprise that AI writing tools are becoming an increasingly hot topic.

Unfortunately, AI-generated content lacks creativity, personality, and context most of the time.

This begs the question, “Can Google detect AI content?”.

If so, you’ll want to future-proof yourself and use the best AI content detectors to make your content authentic in the eyes of Google.

Publishing unedited AI-generated content for the purpose of ranking is a no-go under Google’s webmaster guidelines.

You might have gotten away with it in the past but not for much longer.

In this article, I’ll cover the best AI content detectors to protect your articles by avoiding spam detection, increasing rankings, and improving user experience.

What Are the Best AI Content Detectors?

1) Originality AI

Best for Web Publishers

Originality.AI Homepage

Originality.AI is an AI-detection and plagiarism checker tool targeted toward serious content publishers.

According to tests run by them, they are one of the most accurate AI detectors for GPT3 content, with only slightly reduced results for GPT3.5 and ChatGPT.

Update: They announced on February 24th, 2023, via email that they have an unreleased AI Model, which was even more accurate.

Results were 99.07% accurate on 35k GPT-3 samples and 4.86% false positives on 35k known human blog posts.

They also have very generous team features and API integrations.

Key Features

  • Perform a complete website AI content and plagiarism audit with a button click.
  • Can accurately detect AI-generated content from tools using GPT-3, GPT-2, GPT-NEO, GPT-J, ChatGPT, and GPT 3.5 (DaVinci-003) with a success rate of 94%+. (Soon to be greater)
  • Able to detect paraphrased content with 93% accuracy.
  • Text highlighting to identify the specific sections that triggered the AI detector.
  • Integrate your Originality.AI data into custom applications with their API.
  • Add and remove unlimited team members while managing individual access through a single dashboard.

Pros and Cons of Originality.AI


  • Very simple to use a checker that gets the job done
  • Highest accuracy among all the AI detectors on this list
  • Extremely reasonable pricing for the quality you are getting


  • It only supports English at the moment
  • Can’t export reports


Originality.AI Pricing Plans

Originality.AI currently only has one pricing model.

It costs $0.01 per credit, where one credit scans 100 words.

That means a 2500-word article will only cost you $0.25.

2) Winston AI

Best Originality AI Alternative

Winston AI Homepage

You probably haven’t heard about these guys yet, but I can tell you “best originality AI alternative” doesn’t mean Winston AI is inferior.

It has the potential to overtake them.

For a relatively new tool, it’s packed with a ton of unique features that most of the detectors on this list lack.

Originality AI currently wins in accuracy but falls short in other areas compared to Winston AI.

I spoke to the founder via email and got some interesting nuggets.

Key Features

  • Their model was fine-tuned on AI-generated content from popular tools like GPT-3, ChatGPT, Jasper, Copy AI, and more.
  • Tested on other NLPs such as AL21Lab’s Jurassic-1 model and still boasts an average 96% AI accuracy detection.
  • Extract text from scanned documents, pictures, and even handwritten notes using OCR (Optical Character Recognition) technology.
  • You have the option of having printable PDF reports.
  • Copyscape plagiarism integration.

Pros and Cons of Winston AI


  • Very professional user interface and smooth user experience
  • Only one with OCR integration at the moment
  • Email and chat support
  • Upcoming features include more language support, a website scan feature, a line-by-line analysis, a chrome extension, and more


  • A very new company, so they are still heavily in the development phase
  • The PDF reports currently lack substance (a more detailed version is said to be coming)
  • It can’t scan using URLs at the moment


Winston AI Pricing Plans

Winston AI offers the following pricing plans:

  • FREE: $0 per month
  • GROWTH: $14 per month if paid annually. $18 if monthly.
  • CUSTOM: Contact their team

Get started for free. No credit card is required.

3) Passed AI

Best AI Content Detector Chrome Extension for Academic Institutions

Passed AI Homepage

Passed.AI is the ultimate solution for educators to prove that submitted work is either student-written or AI-generated. 

It leverages Originality.AI‘s accurate AI detection algorithms API and other leading NLP models to detect plagiarism and cheating.

Passed.AI ensures the highest level of AI detection through a full document audit trail to decipher the exact activity used to create the content.

No other tool can match its enforceability.

Key Features

  • Document History Audit: Check the naturality through a replay function that tracks document activity metrics like changes, inserts, deletes, and alterations. 
  • Multiple Language Models: Capture a broad spectrum of AI content created by popular models like GPT-3, GPT-3.5, GPT-2, GPT-J, and GPT-NEO with a 94+% accuracy.
  • Military Grade Security: Ensure all your private information is safe with military-grade 256-bit encryption.
  • LMS Integration: Improve learning outcomes by integrating Passed.AI audit feedback with your LMS via their REST API (Incoming feature).

Pros and Cons of Passed AI


  • No software installation needed
  • Check Google docs directly with the chrome extension
  • Unique document history audit system to promote enforceability
  • Future ChatGPT integration to assist with grading and marking


  • Doesn’t work with other long-form editors
  • Wasn’t trained on proprietary datasets


Passed AI Pricing Plans

Passed AI offers the following pricing plans:

  • STARTER: $12 per month
  • TEACHER: $35 per month
  • INSTITUTION: Contact their team

Start your 14-day free trial now. Get a full refund within this period if you’re unsatisfied.

4) Content at Scale

Best Free AI Content Detection tool

Content at Scale AI Content Detector

Content at Scale is one of the new guys on the block offering an excellent 100% free AI detector.

It can check for AI-generated content made by GPT-3, ChatGPT, and other AI models with decent accuracy.

However, if you are also looking for a one-click solution to get full blog articles that are search engine optimized, plagiarism free, and pass AI detection, check out my full Content at Scale Review.

Key Features

  • The software was built by content marketers, copywriters, and SEOs with decades of experience.
  • Can produce AI-generated content that passes detection.
  • Text highlighting and other probability metrics to identify certain flagged areas.
  • Combines various proprietary natural language processing neural networks on top of GPT-3 through ensemble learning.
  • Able to detect more nuanced writing structures and phrases than free tools.

Pros and Cons of Content at Scale


  • The only tool is not reliant on the same models as most AI detection tools
  • Best AI content detector among the free options
  • Supports over 100 languages
  • Can enter a maximum of 25000 characters


  • No reporting mechanism
  • Not as accurate as the paid options on this list


Content at Scale’s AI detection tool is completely FREE.

5) Crossplag

Best for Academic Integrity

Crossplag AI Content Detector

Like Originality.AI, Crossplag has a plagiarism checker and AI content detection features.

Originality operates on a credit system, while Crossplag is free to use.

The team seems to be positioning the tool toward academic integrity and enterprise usage.

Key Features

  • It’s based on a fine-tuned model RoBERTa using OpenAI’s massive dataset.
  • Shows a percentage probability scale to determine if the content was human-written text or AI-generated.
  • No sign-up is required. Just paste and check.

Pros and Cons of Crossplag AI Content Detector


  • Completely free AI detection tool
  • Potential academic applications
  • Active development from the team


  • It only supports English content for now
  • Can only scan up to 1,000 words at a time
  • Still in beta, so it might not be as accurate


Crossplag’s AI detection tool is FREE to use.

6) Sapling

Best Runner-up Free AI Content Detector

Sapling Ai Content Detector

Sapling is an AI messaging assistant for Customer-Facing Teams. 

Still, the team has developed a free AI content detector that is surprisingly quite good and up-to-date.

Key Features

  • Super easy to copy and paste, and bam, you get the results.
  • Able to accurately detect AI content generated by recent models like GPT-3 and ChatGPT.
  • You can scan an entire average-length blog post up to 2500 from my testing.

Pros and Cons of Sapling AI Content Detector


  • More updates are coming despite being a free tool and not their main product
  • Can scan an entire article of average length


  • Requires 50 or more words to give an accurate reading
  • Their main products cater to CRM and messaging platforms, so their AI detector may not be fine-tuned with the relevant web copy


Sapling’s AI Content Detector is entirely FREE.

7) Writer

Best for API Integration

Writer AI Content Detector

From their name, you can guess that Writer is an AI writer tool that helps you…well, write content – duh.

To stay competitive, it’s also reasonable to expect they would have an AI content detection tool for their users to check for AI-generated text.

And similar to other tools, theirs also show a content score as a percentage.

Key Features

  • Able to detect content by GPT-3 and ChatGPT with superb accuracy.
  • No frills way of analyzing your text by simply pasting it in a box and getting a score.
  • Built into their content creation service, plagiarism detection, and many others.

Pros and Cons of Writer’s AI Content Detector


  • You can request an API key to integrate with your app, but you must be on their team plan
  • Near-perfect scores for a free tool
  • The team seems to update it to detect new AI models, as it was previously only built to detect GPT-2 content


  • It can only analyze up to 1,500 characters or roughly 300 words at a time
  • The tool bugs out sometimes and scans lesser than advertised


Writer’s AI Content Detector is entirely FREE.

8) Kazan SEO

Best for Detecting Bulk AI Content Through URL

Kazan SEO AI Detector

Kazan SEO is an entire SEO toolkit that includes an AI content detection tool as one of them.

Outside of AI detection, they have a content optimizer, text extractor, keyword clustering tool, and many other SEO tools.

Key Features

  • Easy-to-use UI with visual indicators showing whether the content is human-written text or AI-generated.
  • Bulk import URLs to automatically scan them for AI-generated text.

Pros and Cons of Kazan SEO


  • Produces one of the more accurate scores compared to the other free tools on this list
  • You can jump in between other SEO tools with ease
  • Able to bulk-check AI content


  • You need to input a minimum of 200 words to give accurate readings
  • It can only scan about 400 words or 2500 characters at a time


Kazan SEO AI Content Detector is entirely FREE.


Best for Detecting GPT-2 Content Scientifically

GLTR AI Content Detector

GLTR (Giant Language Model Test Room) is an AI detection tool created through a collaboration between MIT-IBM Watson AI Lab and Harvard NLP.

It was trained on the GPT-2, 117M language model from OpenAI to analyze text and determine how likely a human-created content was.

The tool assigns probabilities to each word by comparing text inputs to what GPT-2 would have produced instead and highlights them using different colors.

If there is a lot of text in Green and Yellow, it’s likely AI-generated.

But if there is also a lot of Red and Purple text, it’s more like it is human-written.

Key Features

  • It produces text highlights to indicate whether it’s AI or human text.
  • A scientific tool that provides forensic analysis of a language model’s text input.
  • Created by brilliant research scientists and professors from MIT, Harvard, Cornell, and IBM.

Pros and Cons of GLTR


  • Visual feedback, which is rare compared to even more recent tools
  • Multiple metrics like probability tables and histograms to justify results
  • Scans GRE texts with complex words for AI-generated content


  • An outdated model that is trained on an old dataset like GPT-2
  • Unlikely to produce accurate results on content generated by newer AI models


GLTR is entirely FREE.

10) Hugging Face

Best Open Source GPT-2 AI Content Detector

Hugging Face AI Content Detector

Hugging Face is a huge AI community that focuses on democratizing artificial intelligence through open source and open science.

Digging hard enough into their repositories, you can find a decent AI content detection tool.

Key Features

  • Easy to use interface by copying and pasting your text into the input box.
  • Produced by a niche machine learning community.

Pros and Cons of Hugging Face AI Content Detector


  • Can detect AI-written content by GPT-3 and chatGPT


  • Trained on GPT-2 data, so newer topics and writing styles might not produce accurate results


Hugging Face AI Content Detector is entirely FREE.

11) GPTZero

Best for Detecting AI Content in Academia Niches

GPTZero Homepage

GPTZero allows you can easily spot fake text in academia and highlight the sentences likely to be AI-written.

It was trained on a large corpus of human-written text that spans student-written articles, news articles, and question-and-answer datasets across multiple disciplines in the sciences and humanities.

With over 1 million users, it’s quite an impressive feat by the Princeton student and founder Edward Tian.

Key Features

  • Unique Scoring Markers: Uses perplexity and burstiness to measure randomness and variation in the randomness of text, which are generally high for human-written text and low for AI.
  • Text Highlighting: Provides a holistic score for how much of the document is written by AI with text highlights.
  • Enterprise Solutions: Offers batch uploads for multiple files, API access for organizations, and support for setup and integration.

Pros and Cons of GPTZero


  • Fine-tuned detection models for education on paid plans
  • Can classify 99% of human-written articles correctly


  • Only able to detect AI-generated content with 85% accuracy
  • Can only detect English content


GPTZero Pricing Plans

GPTZero offers the following pricing plans:

  • GPTZero Classic: $0 per month
  • GPTZero Educator: $9.90 per month
  • GPTZero Pro: $19.90 per month

What Are AI Content Detectors?

AI Content Detectors are software tools that use artificial intelligence to determine if a piece of text content is written by a human or a robot.

How Do AI Content Detectors Work?

AI content detectors work by recognizing specific patterns or characteristics of the input text content by comparing it with the data it was trained on.

It recognizes similarities in the input text’s structure, phrasing, and frequency and then assigns a probability score.

So, when it finds something that matches what it has learned, it will flag it as a positive match and classify the words or entire paragraph accordingly.

This process falls under NLP (Natural Language Processing) with machine learning or deep learning using neural networks to produce an artificially intelligent model that can take an input and give an output as a prediction.

Without going into too much detail, an AI model is trained like this:

Lewagon Natural Language Processing Overview Diagram
From my old Data Science notes.
  • Preprocessing: Basically, to clean up the text and make it look more presentable by removing symbols, inconsistent capitalizations, etc.
  • Vectorizing: Turning those cleaned text into numbers to feed into the machine learning models because most machine learning algorithms do not directly understand words.
  • Training: Now you take those numbers, run them through an algorithm like Multinomial Naive Bayes, and have a natural language processing model.
  • Predicting: Finally, you take a piece of text you want to test, throw it into the new model you have just trained, and it will predict whether it’s AI content.

Are AI Detection Tools Worth It?

You don’t want to create content blindly with AI marketing tools only to be penalized by Google in the future.

AI detection tools are definitely worth using to ensure that the content written by an AI tool or even freelance writers (because some of them use AI writers even when they tell you they don’t) don’t get flagged.

Besides, most of the tools on this list are free, so there is no excuse not to use them.

Why Is It Important To Detect AI Content?

By detecting AI content, we can ensure that the information we view and interact with is authentic and accurate.

Here are other practical applications:

  • Preventing Google from flagging AI content as spam.
  • Preventing employers from getting ripped off by writers who say their content is original.
  • Ensure that the writing makes sense and is logical.
  • It keeps the human’s creative juices flowing and prevents laziness.

What are the Limitations of AI Detector Tools?

The limitations of AI Detector Tools will always be the data it’s fed and trained on.

Because if the training data is not a good representation of the type of content, the tool will be analyzing, then the results are likely to be inaccurate.

AI Model Limitation Analogy

Imagine if you knew nothing, and I started by showing you pictures of different Chickens.

The word next to each image also says “Chicken.”

So now you have learned what a Chicken looks like without knowing any other kind of bird existed.

Now, if the following image I showed you were a duck, knowing only what a chicken is, you would think it’s similar and say it’s also a chicken.

Here are more limitations:

  • AI tools can only understand patterns and derive conclusions from them. They can have no concept of context, leading to false positives and negatives.
  • They may struggle to understand and detect more nuanced or subtle forms of content, such as sarcasm, irony, or satire.
  • Not all training data is publicly available, but sometimes it could be illegally scraped online, raising privacy, ethical or legal issues.
  • Definitely not a “let Jesus take the wheel” solution, so human oversight is still needed to review flagged content and make final decisions.
  • As AI systems are based on machine learning, they require continuous updates and maintenance to adapt to the changing nature of the content, which may require additional cost and effort.

Best AI Content Detectors (FAQ)

What Is The Best Free AI Detection Tool?

The best free AI detection tool is Content at Scale that uses multiple natural language processing models aside from OpenAI’s widely available GPT series.

It’s the best free standalone AI detector that offers text highlighting, probability metrics

Should I Use an AI Content Detector?

Yes, you should use an AI content detector to check your content for originality and quality before publishing it on your website. Google considers raw and unedited AI-generated content low-quality and spam that may get penalized.

Uusing an AI content detector can help you avoid Google’s webmaster guidelines violations and improve your website’s ranking

Can Turnitin Detect AI Writing?

Yes, according to them, Turnitin Originality can detect AI-assisted writing.

They have been the gold standard for upholding academic integrity for decades, so you can be sure that they will clamp down hard on this.

How Can You Tell if Something Was Written by AI?

Put the text through any of the AI Detectors I mentioned in this article, and you will get a score telling you the result.

Without it, it would be pretty difficult to tell them apart.

Are AI Content Detectors Accurate?

Yes, AI content detectors are mostly accurate, but never 100%. They can only give you the likelihood of it being human-written or AI-generated text.

Can Google Detect AI Content?

Yes, Google can most likely detect AI content. Google’s webmaster guidelines have stated that AI-generated content may be considered spam if not made with users in mind.

To Sum up

Alright, that’s a wrap.

No matter what industry you are in, you can stand to benefit from AI writing tools.

However, you can’t just publish AI-generated content without adding a human touch.

Using AI content detection tools, ensure you don’t take Google’s or any other search engine’s policies for granted.

Checking before posting will ensure that your articles are spam free and safe from future core updates from Google, should they take further action by clamping down on AI-generated content.

I hope this helps you, and remember to share this blog post with others.

Leave a comment below if you have other exciting things to add.

Struggling To Start Content Creation?

Get Your FREE Guide

Come join The Raw Baw – my newsletter and receive your FREE 30-Page Quick Start Guide to remove any roadblocks you might have.

Brendan Aw in a white collar buttoned up shirt.

About the author

Brendan Aw

Brendan is the Founder and Editor-in-Chief at™, where he helps others succeed in the creator economy. Before launching his blog, he was the marketing manager at various E-commerce, NFTs, Crypto, Marketing Consultancy, Finance, and E-sports companies. He now works on his family’s luxury lighting business in Cambodia while documenting his journey as a creator online.

Learn more about me.


  1. Brendan Aw Tracey Deacker says:

    Love the energy on the blog, truly a great read.

    Which one would you think is the best (performance, UI, feel etc) in your opinion?

    1. Hey Tracey!

      I feel that overall Content at Scale is the best. In terms of accuracy, Originality.AI still had more accurate predictions but [email protected] still had some false positives/negatives.

      [email protected] just recently had an update to their AI content detector and provided users with more metrics.

      It now highlights text sections while showing predictability, probability, and pattern. The UI is also sleek and quick to give results.

      Maybe you could do an accuracy, precision, and recall test 🙂

Leave a Reply

Your email address will not be published. Required fields are marked *