10 Best AI Detector Tools in 2025

• Aug 28, 2025
• 6 min read

• Tags: Fiction, Language, Nonfiction

If you’re looking for the best AI detectors, your search ends here! Discover all features, pros, cons, and pricing of the top AI detectors. This article will cover various AI writing detectors to help you make an informed decision. 

We’ve also included open AI checkers that provide additional services like humanizing the content. Assistive tools, such as AI writing software, have significantly influenced the content creation process, and our analysis will help you understand their impact. Whether you’re a student, writer, or business professional, this list will help. So, without wasting time, let’s begin! 

1. GptZero 

GptZero is a fast and effective AI content detector. It functions as a ChatGPT AI checker and can also identify AI content from Bard and LlaMa. 

Pros

• It allows you to scan up to 5,000 characters at a time for AI-generated content. 
• Its Deep Scan feature gives a statistical analysis of how every sentence has AI probability. 
• Its free version allows you to scan 10, 000 words per month. 
• You can upload 10 files at a time for scanning documents.
• Additionally, GptZero can assist in the editing process by providing feedback on sections, helping users refine their content. 

Cons 

• It doesn’t include additional options for humanizing and paraphrasing the content like other tools. 
• The premium version doesn’t give the option to scan more than 10 files like other tools. 
• The ‘Writing Feedback’ option is only included in the Premium version and not the free version. 
• If there is a mix of human and AI content, it is unable to accurately identify how much content is AI-generated. 

Price: It offers 3 Packages for its AI detection service: Essential ($10 per month), Premium ($16 per month), and Professional ($23 per month). 

2. ContentDetector.AI

ContentDetector.AI is one of the top AI content checkers. Featured on Product Hunt, it’s a free AI detector. 

Pros 

• It functions as a ChatGPT AI detector (it can identify Gpt 3.5 and GpT 4 content). 
• It gives a probability score showing the percentage of AI-generated content. 
• It gives an option to humanize AI sentences. 
• It provides statistics such as the word count and the character count. 

Cons 

• It isn’t 100% accurate and sometimes fails to achieve complete accuracy, wrongly identifying human content as AI-written content. 
• It doesn’t provide additional features to upload and scan files in bulk. It can, however, flag AI-generated content to help users identify it.
• It doesn’t provide an extension to use it while editing docs on Word or Google Docs. 
• Unlike other tools, to export the file, you need to sign in and create an account. 

Price: This is a free AI checker tool. 

Now let’s understand how to detect AI writing using ZeroGPT.

3. ZeroGpt 

ZeroGPT is a reliable AI checker. It’s a free tool where you just need to paste the text. ZeroGpt aims to minimize false accusations of human-written content being flagged as AI-generated.

Pros

• It gives a percentage of the AI content detected. 
• It is more accurate as compared to free AI checkers like Writer. 
• It functions as a ChatGPT checker and can detect AI content from ChatGPT. 
• It checks AI content for 15,000 characters at a time. 

Cons 

• It fails to identify some AI text accurately.
• The free version doesn’t allow uploading more than 5 files at a time for an AI content check. 
• The yearly plan is more costly as compared to other tools. 
• The free version includes the option to paraphrase only 300 words at a time using an AI Paraphraser. 

Price: It has both a free and a paid version. The monthly package starts from $7.99 per month and the yearly package costs $18.99 per month. 

4. Copyleaks 

Copyleaks is one of the most popular plagiarism and AI checker tools. It can detect AI content in multiple languages in seconds. 

Pros

• It detects AI content from various AI tools including ChatGPT and Gemini Plus, and can even differentiate AI refined content.
• It allows you to scan multiple files simultaneously. 
• It creates a similarity report which you can share (if required). 
• You can easily integrate it with Chrome by installing its extension. 

Cons 

• Sometimes, Copyleaks flags humanly written content as AI content. 
• It ignores some AI content in the text sometimes. 
• When the same text is analyzed more than once, it can give different results in a few cases. 
• Scanning documents of greater word count can take more time. 

Price: The monthly package for Copyleaks AI detector starts from $9.99 per month.

5. Undetectable AI 

Undetectable AI is one of the best AI detectors for analyzing academic writing and business papers. Rated as the best AI detector by Forbes, it has a simple interface where you just need to paste the text.

Pros 

• It can accurately detect AI content from ChatGPT. 
• It has a ‘HUMANIZE’ option to rephrase AI content. 
• You can paste up to 10,000 characters at a time and check the text for AI content. 
• It can identify AI content in various languages like English, German, and Portuguese. 

Cons 

• It sometimes flags human text as AI content. 
• It doesn’t identify the source of the AI content. 
• It can give different results for the same text in a few cases. 
• Some of its paid plans are expensive. 
• Undetectable AI sometimes flags human writing as AI content.

Price: Its monthly package costs $9.99 per month. 

6. WinstonAI 

Winston AI is one of the most trusted AI detectors for writers, academics, and web publishers. It can detect AI-generated content from ChatGPT, Bard, and many other language models. It also has a fast and efficient plagiarism AI checker.  

Pros 

• It supports various file formats like .docx, .png and .jpg. 
• It gives scores of the human-written content, readability, and plagiarized content. 
• It can generate a report analyzing the AI-written content within seconds. 
• It also scans texts written by hand. 
• It can detect AI-generated text from various language models.
• WinstonAI keeps up with the latest models of language generation technology to ensure high accuracy in detection.

Cons

• The option to generate shareable PDF versions is only a part of the paid packages. 
• You can only scan up to 2,000 words using the free version. 
• It doesn’t provide additional options to humanize, paraphrase, and summarize the AI-written content. 
• The free version doesn’t include the advanced plagiarism-checking feature. 

Price: This tool has both, a free and a paid version. The paid version costs start from $12 per month. 

7. CrossPlag 

CrossPlag is one of the simple and effective AI detector tools. To use its AI checker, you need to create an account on their website.  It can also detect AI content created by AI resume builders using resume prompts. With this, CrossPlag also has a plagiarism checker. It’s plagiarism and AI checker can be used by students, teachers, and businesses worldwide. 

Pros 

• It provides an AI content index, identifying which content, human, AI, or a mix of both including AI refined content.
• It doesn’t store your data, ensuring your data safety. 
• It can detect AI-generated content within seconds. 
• It gives a feedback option where you can mention whether you’re satisfied or not with the result.
• CrossPlag can also assist in the editing process by providing feedback on AI-generated sections. 

Cons 

• Currently, it supports and detects AI content in only English language documents. 
• It can take a longer time to process and scan documents for AI-generated content sometimes. 
• It doesn’t provide options to upload files in bulk like other AI detectors. 
• It doesn’t offer options to humanize, summarize, or paraphrase content like other AI detectors.
• It’s not 100% accurate and can fail to show AI-generated content at times. 

Price: This is a free AI detector.  

8. BrandWell (previously Content at Scale)

BrandWell is a widely used AI detector. It functions as a ChatGPT AI detector and can easily identify AI-generated content from GPT4. With this, it can also identify AI content from Bard, Claude, and Gemini. BrandWell can identify AI text from various language models, ensuring accurate detection and analysis.

Pros 

• It highlights human-written sentences in green, differentiating them from AI-written content. 
• The paid version has the option to rewrite all AI-generated sentences. 
• It gives the option to download the checked content as a PDF for sharing. 
• It analyzes whether the sentences sound robotic and gives suggestions for content editing. 

Cons 

• It sometimes wrongly terms AI written content as human content.   
• Many essential features like scanning the text by URL, exporting to Word/Doc/HTML, and rewriting AI articles in bulk are only available for users opting for the paid version. 
• Using the free version, you can only scan up to 2,500 characters at a time for AI-generated content. 
• The free version doesn’t offer additional features like a Summarizer and plagiarism checker like other tools. 

Price: The paid version costs $49 per month. 

9. Sapling 

Sapling is a basic AI detector that analyzes content written by AI writing tools within seconds. It also allows you to edit the reviewed text and recheck it for AI content.

Pros 

• It acts as a ChatGPT checker and can also identify AI-generated text from various language models, including Gemini.
• It acts as a ChatGPT checker and can also identify AI content from Gemini. 
• It has a user-friendly interface where you just need to paste text to analyze the content. 
• By installing its extension, you can easily use it on Google Chrome. 
• Users opting for the paid version can check 8000 characters at a time for AI-written content

Cons 

• The free version allows one to scan up to only 2000 characters at a time. 
• Several times, Sapling gives false positives, terming human-written content as AI-generated. 
• It doesn’t provide the option to upload files in bulk for scanning like other tools. 
• It doesn’t provide additional features for humanizing content, detecting plagiarism, summarizing, and paraphrasing like other tools. 

Price: It has both, a free and a paid version. The paid version costs $25 per month. 

After understanding how to detect AI writing using Sapling, let’s explore the last tool! 

10. Scribbr 

Scribbr provides a free AI detector to identify AI-generated content. It’s a useful tool for students, educators, and bloggers. 

Pros 

• It can detect AI content from ChatGPT 3.5, ChatGPT 4, and Gemini within seconds. 
• It gives a percentage of AI-generated content. 
• You can use it to perform unlimited AI checks. 
• It has a user-friendly interface where you just need to paste the text for identifying AI content. 

Cons 

• It can identify AI content for only up to 500 words at a time. 
• The free version doesn’t have the option to upload multiple files for analyzing AI-generated content. 
• It doesn’t include additional options to humanize the content like other tools. 
• It’s not completely accurate and can flag human-written content as AI content. 

Price: This is a free AI detector.

AI detectors for plagiarism detection

All AI content detection tools listed above also offer plagiarism detection features. However, Copyleaks is one of the most well-known tools for detecting plagiarism. It provides a similarity report to help users locate potentially plagiarized content. You can compare the features of all the top 10 tools to decide which is the most suitable for your content. 

AI content detector tools for SEO 

SEO professionals and website owners can use AI content detector to ensure their site’s content appears human-written. Tools like Undetectable AI and Winston AI are particularly useful for this purpose. 

Undetectable AI provides a report on the percentage of AI-generated content. This helps to identify AI-generated content and optimize it for SEO. On the other hand, Winston AI identifies potential sources of duplicate content. This is beneficial for identifying content for SEO. 

Detecting AI-written essays 

Tools like GPTZero are beneficial for detecting AI-written essays.GPTZero helps to identify the vocabulary most commonly used in content written by AI. This helps to identify AI-written content easily. It further ranks the phrases used in AI-generated content based on their frequency. This can also help to detect AI-written essays. 

Comparison of AI detection tools 

Browse through the following table for a comparison of the tools’ additional features!

This concludes our list of AI detector tools. Now that you know the best AI detectors, you can start thinking about which one to choose. By comparing the pros and cons of the best AI checkers, you can select the perfect one. However, these tools might not provide in-depth feedback about your content’s quality.  

At PaperTrue, we provide expert editing and proofreading services for writers, students, researchers, and businesses. With this, we also check the content for plagiarism. 

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Tanvi

With a foundation in Life Sciences, Tanvi enjoys curating technical writing tips tailored for ESL students. When she's not translating complex concepts into bite-sized nuggets, she can be found playing with dogs or painting landscapes.