After experimenting with different AI detectors for many years, I have shortlisted some of the best tools for you. You may find these tools helpful for detecting AI content and reliable, as well.
This is a complete guide to the reliable AI content detection tools that you can use regularly for an assignment as a student or for a project as a professional. Bloggers, teachers, students, working professionals, solopreneurs, or business owners, whatever position you hold, these tools can help you achieve the best results.
If you need more in-depth reviews and my results, please write me a message on LinkedIn here: Eram’s LinkedIn. I can help you choose the right tools according to your requirements.
Disclaimer: These AI content detection tools & checkers do not always provide 100% accurate results. We recommend not accusing any writer/student based on the results given by AI detectors. Make sure to hire a good editor who can manually grasp the patterns and understand if the content is AI-written.
Top AI Content Detector For 2025 (Ranked)
The top AI content detector is Copyleaks, which remains a helpful tool for detecting AI-generated content. It’s free to use and provides quite accurate results.
Here is a quick overview of the best AI detection tools to make your pick easier!
Our Criteria For Choosing These AI Content Detectors
The premise was simple: We know which text is human-generated and which is AI-generated; can the tool being tested verify the same?
But to take it a little further, and given that one tool acts/outputs differently than another, I added three twists in our research to rank the most reliable AI content detectors:
Testing the AI content detectors on text with various niches and sophistication levels
Trying to put these AI tools to the test by intentionally creating misleading and factually incorrect content
Tricking these text detectors with content that’s a mix of human and AI-generated content
In addition, I evaluated the accessibility, affordability, speed, and integrability of the tools to compile the list presented below.
Here, I will provide a detailed explanation of the top AI content detection tools I encountered during my research.
1. Copyleaks
Copyleaks is a popular AI-powered plagiarism detection tool that can also serve as an AI content detector. It can detect content generated through ChatGPT and GPT 3.5 models quite accurately.
During my tests, I found Copyleaks to be the most accurate AI checker out of all the tools. The results offered by Copyleaks were accurate and impressive compared to other tools.
Most importantly, Copyleaks can detect text from nearly every NLP model, including the latest ChatGPT3. The claimed accuracy is around 92%, which was true in our test. The tool accurately identified that the content was AI-generated.
Note that if you use Grammarly and run an AI check on Copyleaks, it may detect AI. In my case, it reduced the likelihood of human error. The best part about Copyleaks is that it comes with a free version. Although you will get a limited number of checks, it is sufficient for people with no major requirements.
Features
Cover all NLP models, including GPT3.5.
APIs for large-scale AI content detection.
Chrome Extension available.
Robust plagiarism checker.
Source code checker.
LMS Integration.
Pros & Cons
Price
Copyleaks AI text detector is Free to use.
2. Winston AI
Winston AI is gradually cementing itself as the most preferred AI detection tool among schools and publishers. And for good reasons: it provides two clear and precise AI detection assessments, including an overall AI detection score and a sentence-by-sentence AI prediction map highlighting parts of your text that are likely to be AI-generated.
Winston can also scan large texts and documents in .pdf, .word, and even photo scans.
With its powerful features, it is one of the most reliable AI detectors! You can get started with the Winston AI detection tool with their free trial. But if you go with their paid plan, you can access their plagiarism detection tool, which also gives a readability score on any text.
Features
99% detection rate
Works with ChatGPT, including GPT-4
Highlights sentences likely generated by AI
Scans very large documents, even books!
Upload complete files in .word, .pdf, and even scans.
Plagiarism detection with sources.
Free readability score.
Price
Free: Up to 2,000 Words Scan.
Growth: $18/month. Up to 80,000 Word Scan.
Custom: Open for flexible pricing for large-scale requirements
*Annual plan can save 33%
While 77% of businesses are using AI globally, the increase in the use of AI writing tools has been significantly higher. Dive into our latest statistics to know more.
3. Writer
Generally, Writer is known for providing enterprises and agencies with the tools to create content. Lately, the AI Content Detector by Write AI has been loved by its users.
It’s pretty straightforward and free to use. One of the best parts is that you don’t even need to sign up! Just enter a URL or text (up to 1500 characters) that you want to test – and in seconds, it tells you the percentage of text that’s human-generated. The higher, the better.
Additionally, Writer rose to prominence for its straightforward integrations and availability for multiple third-party platforms, such as Chrome, Figma, and Contentful.
During my tests, I found writer.com impressive. Compared to other AI detection tools, Writer.com provided accurate results. However, it also sometimes provided false reports.
Features
No sign-up is required to use Writer’s AI detection feature
User-friendly AI scoring system and dashboard.
Can take a URL as input to detect AI text on that particular page
Pros & Cons
Price
Free to use. But supports only up to 1500 characters.
4. GLTR (Giant Language Model Test Room)
If you specifically want to detect text generated through the GPT2 NLP model, then go with GLTR.
GLTR stands for Giant Language Model Test Room and is a free AI text detection tool developed by the combined team of MIT-IBM Watson AI Lab and HarvardNLP. Moreover, the tool has access to the publicly available GPT2 model of OpenAI and is primarily designed for detecting automated text generated through language models.
For the text you paste/input, GLTR analyzes the probability of each word by comparing text inputs to what GPT-2 would have produced instead.
As an output, it highlights the words in green, yellow, or red — in the lowest-to-highest probability order of being AI-generated. Thus, if red word counts exceed the green ones, you might be looking at AI-generated content.
Features
Perfected for GPT2-generated automated text detection.
Text highlights differentiate between AI-generated and human-written content.
Enables forensic analysis of language model text input.
Open source software freely accessible on GitHub.
Price
Available for free.
5. OpenAI Output Detector (Hugging Face)
Developed by OpenAI, the Hugging Face AI Content Detector is based on the 🤗/Transformers implementation of RoBERTa. It primarily aims at professionals in the AI and machine learning segment to test their ideas.
In most aspects, Hugging Face is similar to GLTR and was designed to detect GPT2-generated content. However, instead of highlighting the input text, it simply tells whether the overall content is Real or Fake on a scale of 100%.
Features
GPT2 Text detection.
RoBERTa (Robustly Optimized BERT Pre-training Approach) base detector.
Intuitive and beginner-friendly user interface
Pros & Cons
Price
Available for Free.
6. Kazan SEO
If you want an AI text detection tool specifically for evaluating SEO content, check out Kazan SEO. You only need to sign up to get started with the Kazan AI detection tool.
This comprehensive SEO tool packs multiple other features alongside AI content detection. There’s a Content optimizer, SERP overlap, text extractor, and keyword clustering tool.
Features
GPT3 content detector.
Multi-URL scanning capabilities.
Intuitive SEO tools.
Pros & Cons
Price
Kazan SEO is free to use.
7. Crossplag
Crossplay mainly offers a plagiarism tool, but has extended an advanced AI text detector for some time now.
It’s an intuitive online tool that can detect AI-generated text with reasonable accuracy. Crossplag relies on sophisticated machine learning algorithms and natural language processing to discover the characteristic patterns of AI-generated content.
Additionally, this AI checker displays results on the severity scale of green to red, where green means human-generated content while red means AI.
Features
Machine learning and NLP-based working.
Geared for multiple use cases ( education, SEO, etc.)
Integrity insights and LTI integrations.
Pros & Cons
Price
Crossplag AI content detector feature is Free. However, one needs to pay for the other features.
8. Content At Scale
Content at Acale is another reliable AI detector for analyzing text and ascertaining whether it’s AI or human-written. It’s a free-to-use platform with numerous features that include content curation and SEO optimization.
The makers of Content at Scale claim that this AI checker is one of the first ever. It can go deeper than generic AI content detectors to offer more transparent scoring.
Features
API available on request.
Multiple language support.
A versatile platform that combines AI content curation and detection.
Reliable accuracy.
Pros & Cons
Price
No charge to use content at scale.
9. Sapling.ai
Sapling is famous for providing support solutions for customer-facing teams. However, the platform has added sturdy and up-to-date AI detector tools. Sapling is one of the top free AI text detectors. Whatever text you input, it outputs the probability of that being AI-generated by a model such as GPT-3.5 or ChatGPT.
Moreover, it’s noteworthy that its detector for the entire text and the per-sentence detector uses two different techniques to give a high-accuracy output.
Features
Integration with Chrome, Google Docs, Outlook, and Word.
Detects content produced by GPT3 and other latest models.
Multiple tools to improve writing, including a grammar checker, auto-complete, snippets, and chat assist.
Pros & Cons
Price
Free – Support up to 2500 characters
Pro Plan – $25 per month.
Enterprise Plan – Available on request.
10. GPTZero
GPTZero is a completely free-to-use AI content detector that is taking the AI industry by storm. Within a few months of its release, it got over one million users!
It can help detect content generated by ChatGPT, GPT-3, GPT-4, GPT-5, Bard, and other AI models. It primarily aims to cater to educators.
Features
Unique scoring markers to detect AI content
API solutions for enterprises & organizations
Highlights texts to show you how much content is generated through AI
Price
The basic version is free to use. However, to get advanced features and bulk text detection, you need to sign up as a teacher and verify yourself. To get API access, you need to join the API access waitlist.
11. ZeroGPT
ZeroGPT is one of the most used free AI text detectors on the market.
Do note that it is different from GPTZero. ZeroGPT is an AI company that offers various AI tools, such as the one to talk to ChatGPT directly through Telegram or WhatsApp.
This AI text detection tool uses state-of-the-art DeepAnalyse™ Technology to determine the origin of your text. The creators have analyzed millions of articles and texts comprising both AI-generated and human-written content.
As a result, they have developed the highly accurate ZeroGPT algorithm, which can detect the source of text with an accuracy of up to 98%.
Features
Detects text is written by GPT-4
The AI content detection has an accuracy of 98%
Works with multiple languages
Access to other AI tools
Completely free to use
Price
Free to use.
You can also get private API access to ZeroGPT by contacting its team via email.
12. Originality.ai
Starting with our personal favorite: Originality.ai. Claiming to be up to 99% accurate, this tool is arguably the best one to detect whether content is human-written or AI-generated.
It’s powerful and versatile enough to detect AI-generated text from all the major NLP models, like GPT-3, GPT-2, GPT-NEO, and GPT-J. As per their website, it can even detect GPT 3.5 (DaVinci-003) model-generated AI text.
However, Originality detected AI even when the content was manually written. So, despite its claim of being 99% accurate, I wouldn’t entirely call it ‘accurate.’ Instead, you can use it to verify the content along with other AI detectors.
Originality.ai Features
All NLP models are supported.
AI content detector and Plagiarism Checker
Support Multiple Team Members
Full Site scan feature in the pipeline.
APIs and Integrations are available.
Cost Effective
Price
Originality.ai costs $0.01 per 100 words checked.
There is no limit on the number of users and websites scanned, and full access to features.
13. Grammarly AI Detector
Grammarly recently launched its AI detector tool, which is a part of its plagiarism checker. It checks for plagiarism and AI content simultaneously. All you need to do is copy and paste the content and run an AI check. The tool will flag the AI-written part.
Personally, I feel the feature is best for students since they can check grammar errors, plagiarism, and AI under one roof rather than spending on different tools.
However, you cannot run the AI detector through the free version. You’ll have to upgrade to the paid plan.
Grammarly AI Detector Features
Supports all NLP models
Checks for plagiarism at the same time too
Works as an extension for Chrome too
Comes with plenty of other AI features
Supports team members inclusion
Price:
In order to use the Grammarly AI detector, you will have to buy Grammarly’s paid plan. It starts at $12/month.
Since you’re here, you might also like reading our tested AI art and image generators.
How Accurate Are AI Content Detectors?
Like the idea of building a bridge stems from the need to connect two land bodies separated by water or a valley, the one uncompromisable aspect of all AI content detectors is accuracy.
As seen above, these AI content detectors vary in terms of their features, with some being free, some paid, and some offering plagiarism checks, while others do not. Additionally, some can handle large text inputs, while others cannot. But if any of them is inaccurate, their use is questionable. And the sad news is that no AI text detector tool is 100% accurate.
As mentioned earlier, I tested multiple tools in various ways for quite some time, but I found that the overall accuracy of AI content detectors ranges between 65% and 90%.
As AI text generators keep evolving, it’s only a matter of time before AI text detectors catch up to them. Additionally, as policymakers worldwide scrutinize AI-related tools, a proposal for a balance between AI creation and detection could be beneficial for everyone.
How To Choose The Best AI Content Detection Tool?
To find the best AI detection tool that best suits you, first know what you wish the tool to do. By doing that, you can have a better idea of your requirements.
The best AI checker will have:
Text highlighting
Plagiarism checker
High accuracy of content detection,
Can flag inappropriate content
Additionally, compare your budget with the pricing plans provided. Lastly, many tools have trial and demo versions. You can use multiple tools to determine which one is easy for you to use.
Have a proper mix of all the parameters, and you will automatically be able to find the best AI detector for you.
Which Is The Most Accurate AI Detector (Our Test Result)
No AI checker is accurate. However, some of these AI checker tools do a decent job of flagging AI-generated content. Out of all the tools I have used so far, two of them were able to detect AI easily.
One of the best parts about them is that both are my top picks for the best free AI detectors!
Copyleaks – 92% accuracy
Writer.com – 90% accuracy
Note: Ratings are based on my personal experience.
Since both tools are free, I ensure that I run checks through both before the final copy is completed. In many instances, Writer.com detected content as AI-written despite being written manually. On the other hand, Copyleaks can detect AI quickly.
However, I still consider Copyleaks one of the most reliable AI detector tools!
Wrapping Up: Copyleaks Is One Of The Best AI Content Detector Tools
Copyleaks is the best AI content detector, but Winston AI, Writer AI, and Originality.ai are also great choices for AI content detection.
However, I suggest trying their free plans or free trial, if available, and see which tools you find most effective in detecting AI in your content. All the AI detection tools I suggested are user-friendly, with a simple interface that even beginners can easily understand.
At last, note that even though these AI content detectors will help you to write in a more humanized way, they are not 100% correct. Therefore, it is best to read the content even after it is flagged as AI-written for improved output.
FAQs
Google has often stated that it considers AI-generated content of low quality. Therefore, pure AI content is against Google’s webmaster guidelines. Recently, John Mueller, Google’s Search Advocate, reiterated that AI-generated content is considered spam. Therefore, checking your content for originality before publishing it on your website is prudent.
It depends on your requirements. Both paid and free AI text detectors are available. However, if you’re committed to accuracy, I think there’s no better tool than originality.ai. If you are looking for a free tool, content at Scale and sapling.ai is worth considering. While the former is more geared toward accuracy, the latter is committed to AI text detection for all NLP-based models.
In all likelihood, Google can detect AI content. Its webmaster guidelines explicitly state that AI content is low quality and spam. Therefore, it’s safe to assume it must have placed mechanisms to detect AI content.
AI content Detectors rely on the same NLP models that the AI writing tools utilize to generate text. In short, they are trained to detect the inherent patterns and use of words and phrases in AI content. These tools then rate the content based on the likelihood of how Google will see it.
While no tool is 100% reliable, Copyleaks has demonstrated an accuracy rate of around 92% in detecting AI-written content. Since the tool is free to use, you can test it out!
Several tools and programs claim to detect whether a text was written by AI or a human. However, the accuracy of these tools is questionable.
An AI content detector is a tool that employs artificial intelligence (AI) to distinguish and identify content created by AI writing tools.
Our top-rated AI content detector is Originality.ai. It is an essential tool for content operations, as it effectively detects AI-generated content and plagiarism.