15 Best AI Content Detectors to Spot AI-Written Text in 2025
AI-generated content is growing at lightning speed. A recent study shows that 74.2% of new web pages already contain AI-written text. Researchers also estimate that nearly 30–40% of all active online content may now be AI-generated. No surprise then that 78% of people say it’s harder than ever to tell AI from human writing.
With so much AI-written material online, businesses, educators, and readers all need reliable ways to check authenticity. That’s where AI content detection tools come in. In this article, we’ll explore the Top 15 Best AI Content Detectors that help you separate human-written words from machine-generated text.
Why AI Content Detectors Are Important
- Maintain Authenticity: Helps businesses, educators, and publishers ensure that the content is truly human-written.
- Protect Academic Integrity: Prevents misuse of AI in schools and universities by spotting machine-generated essays or reports.
- Boost SEO Performance: Ensures content meets Google’s guidelines and avoids being flagged as low-quality or spam.
- Build Audience Trust: Readers are more likely to trust brands and publishers that share authentic, human-written content.
- Ensure Compliance: Many industries like legal, healthcare, and finance require original, trustworthy text.
How AI Content Detection Tools Work
- Perplexity Analysis: Evaluates the text’s degree of predictability or randomness; AI is typically more consistent.
- Burstiness Check: Analyzes sentence length and variation since humans write with more natural diversity.
- Probability Scoring: Provides a percentage likelihood of whether text is AI-generated.
- Sentence Highlighting: Marks sections that appear machine-written for easy editing.
- Model Training Updates: Regularly updated to detect outputs from the latest AI models like GPT-4, Claude, and Bard.
List of Top 15 Best AI Content Detectors in 2025
1. Originality.AI
Originality.AI is the most robust AI content detector and it is popular among publishers, SEO experts, and universities. In contrast to the simplified plagiarism checkers, it is particular to the text produced by the AI model, namely GPT, Claude, or Bard. The platform provides almost a hundred percent detecting rates through sentence predictability and semantic programs. It is especially popular with people who own websites and promote their content to keep it original and E-E-A-T content according to Google standards.
The difference with Originality.AI is that it offers two features; simultaneous plagiarism check and AI-written content. This combination makes it a one-stop solution to the professionals who are credibility and compliance-conscious. Originality.AI is being learned and updated in new AI models. Originality.AI is a trusted choice in the current rapidly developing AI industry.
Top Features & Working:
- Detects content from GPT, Bard, Claude, and other models
- Integrated plagiarism detection system
- Team collaboration features for agencies and editors
- Continuous updates with newer AI versions
- Easy API integration for large-scale use
Website: https://originality.ai/
Pricing:
| Pro | Pay as you go | Enterprise |
| $12.95/mo | $30/mo | $136/mo |
2. GPTZero
GPTZero became incredibly popular when it was launched to identify ChatGPT-generated essays and assignments in schools. It relies on two big concepts: perplexity (random the text is), and burstiness (sentences vary in length) to detect AI-generated content. Human writing is generally less predictable and GPTZero can therefore accurately distinguish between human written and machine written text.
It has taken its place in the educational sphere, where teachers and professors can notice possible AI abuse among students. Along with academia, it is now being used by journalists and businesses who wish to ensure that content is authentic before it is published. This makes it easy to use with simple reports even in cases where the user is non-technical.
Top Features & Working:
- Measures perplexity and burstiness to flag AI content
- Bulk file upload and batch analysis
- Detailed sentence-level highlighting of AI sections
- Works with multiple AI models and text formats
- Web-based and accessible via all major browsers
Website: https://gptzero.me/
Pricing:
| Essential | Premium | Professional |
| $8.33/mo | $12.99/mo | $24.99/mo |
3. Winston AI
Winston AI is intended to be used by publishers, educators and those creating content and in need of solid AI detecting. It favors a variety of languages and so it best suits international users who handle multilingual information. The tool offers a clear percentage score of the approximate percentage of text that is likely to be generated by AI, and it draws specific sentences to facilitate easier review.
The other benefit of Winston AI is its ability to be used in various content workflows. Bloggers, SEO experts, and teachers can use it as an example in their everyday activity. It also supports PDF, word and text document scanning, and can batch process schools or organizations with large content volumes.
Top Features & Working:
- High accuracy AI content detection with percentage scores
- Multilingual support for global users
- Document scanning (PDF, Word, TXT)
- Sentence-level highlighting for easy review
- Team accounts for collaborative use
Website: https://gowinston.ai/
Pricing:
- Available on request
4. Copyleaks AI Detector
Copyleaks is an established plagiarism detector service that has ventured into AI content detection. Enterprises, teachers and government agencies have great faith in it because it meets the industry standards. The AI detector is based on deep-learning models to differentiate between human text and AI text produced by applications such as ChatGPT, GPT-4, and other large language models.
The site offers extensive probability scores and can offer enterprise-level security, which is especially attractive to fields such as legal, healthcare, and academia where information security is paramount. Copyleaks is also LMS-integrated, so it is a best fit for schools and universities.
Top Features & Working:
- Detects AI-generated text across multiple AI models
- Enterprise-grade data security
- Integrates with LMS platforms like Moodle & Blackboard
- Sentence-level detection with confidence scores
- API access for large organizations
Website: https://copyleaks.com/
Pricing:
| Personal | Pro |
| $13.99/mo | $74.99/mo |
5. ZeroGPT
Another popular AI content detector that is widely used is ZeroGPT, which is free and scans accurately. The tool applies a deep-learning algorithm to analyze a text on the basis of statistical probability, patterns of words, and contextual anomalies. Its results (including percentages) are understandable even to first-time users, making it one of the more reliable AI content detection tools available today.
ZeroGPT is particularly favored amongst students, freelancers, and small businesses, as they can get free checks without a subscription. The tool tracks parts of the text that are produced by AI, allowing people to quickly understand where there are issues. Although it is free, its ability to detect is comparable to high-end tools, so it is a good tool to use on a day-to-day basis.
Top Features & Working:
- Free-to-use AI content detection
- Percentage-based analysis of AI vs. human content
- Sentence highlighting for easy review
- Supports multiple file formats
- Simple and user-friendly interface
Website: https://www.zerogpt.com/
Pricing:
- Free
Also Read: Content Marketing Analytics Tools
6. QuillBot AI Detector
QuillBot, widely known for its paraphrasing and grammar tools, has also introduced an AI content detector to help users verify the authenticity of text. This tool is designed for students, educators, and professionals who want a quick way to check if their content might be flagged as AI-generated. It provides a clear probability score that indicates whether text is likely human-written or machine-generated, making it simple to interpret.
The QuillBot AI Detector is especially useful for writers who already use QuillBot’s editing suite, as it integrates seamlessly into the same platform. It allows users to scan documents instantly, highlight AI-generated parts, and make edits to ensure originality. This makes it a valuable tool for academic writing, professional reports, and digital publishing.
Top Features & Working:
- Probability-based scoring for AI vs. human text
- Highlights AI-generated sections for revision
- Fast and simple scanning process
- Works with academic, business, and online content
- Integrated with QuillBot’s writing and editing tools
Website: https://quillbot.com/ai-content-detector
Pricing:
| Free | Premium | Team |
| $0 | $4.17/mo | Available on request |
7. Sapling AI Detector
Sapling AI is commonly recognized as a business communication assistant, though its AI detector is also widely used by companies, to provide professional authenticity in emails, reports, and documents. Unlike many solutions designed primarily for students, Sapling caters to businesses and front-end teams. It analyzes text to find AI production patterns and presents the detection’s condensed findings.
The peculiarity of Sapling is that it is integrated with customer support applications and in-office solutions. To make the responses sound natural and credible, businesses can integrate the detector right into the workflows. It can be a helpful sales, HR, and support tool that ensures the team stays transparent in communication.
Top Features & Working:
- AI-generated content detection for professional use
- Enterprise integration with CRM and support platforms
- Real-time detection inside business workflows
- Simple and fast reports for quick decision-making
- Supports multilingual detection
Website: https://sapling.ai/ai-content-detector
Pricing:
| Free | Pro | Enterprise |
| $0 | $25/mo | Available on request |
8. Hive Moderation AI Detector
Hive Moderation is a robust AI solution that is popular in content moderation, AI detection, and compliance monitoring. The AI content detector is based on linguistic patterns, probability scores and sentence coherence. Large enterprises have confidence in Hive, particularly in sectors where brand image and conformity play a vital role.
One of the strongest aspects of Hive is its API-based solution, that enables developers to seamlessly integrate AI detection into their own platforms, applications, and websites. Hive can be especially valuable to businesses that handle large amounts of user-generated content (UGC), as it promotes authenticity and builds trust with the audience.
Top Features & Working:
- Enterprise-grade AI content detection
- API integration for custom platforms
- Detects AI across multiple models and languages
- Scalable solution for high-volume organizations
- Detailed probability-based analysis
Website: https://hivemoderation.com/
Pricing:
- Available on request
9. DetectGPT
DetectGPT is an AI content detection tool that is based on research conducted by Stanford researchers. It can be used to detect the presence of AI-generated text by analyzing the probability distribution of words and sentences, making it very effective. However, rather than only using surface-level sentence structures, DetectGPT looks into the probability that a language model generated the provided content. It is also one of the more scientifically based detection tools.
The difference between DetectGPT and other detectors is that it is more accurate and detects fine AI-generated patterns that other detectors can overlook. It has gained particular usefulness among academicians, publishers, and professionals, who require an effective tool to verify the authenticity of texts. It remains more research than commercial, but the approach offers valuable insights into the differences between AI-generated content and human writing.
Top Features & Working:
- Probability-based detection method
- Built on advanced research from Stanford University
- Detects subtle AI text patterns missed by other tools
- Works effectively for academic, professional, and online text
- Open and research-friendly tool for advanced users
Website: https://detectgpt.com/
Pricing:
| Essential | Pro | Team |
| $15/mo | $29/mo | $59/mo |
10. CrossPlag AI Detector
CrossPlag is a plagiarism detection and originality verification platform that recently introduced AI detection capabilities. It analyzes text through advanced algorithms to detect AI-generated writing and provides a human-to-AI probability percentage. This makes it suitable for both academic and professional settings.
The platform’s appeal lies in its data security and global accessibility, supporting users across different countries and languages. It’s used by educators, businesses, and researchers who want a clear, trustworthy judgment on whether content was written by AI or a human.
Top Features & Working:
- Human-to-AI probability percentage score
- Combines plagiarism and AI detection
- High data privacy and security
- Multilingual support for global users
- Works for education, business, and research sectors
Website: https://crossplag.com/ai-content-detector/
Pricing:
- Free
11. Writer.com AI Content Detector
Writer.com is a leading enterprise writing assistant platform that offers an AI content detector alongside its grammar, style, and GEO tools. It is widely adopted by organizations that prioritize brand safety, originality, and compliance in their communications. The AI detector identifies whether text has been generated by large language models and provides actionable results for businesses.
Unlike many free detectors, Writer.com’s tool is optimized for enterprise use cases. It integrates seamlessly with platforms like Google Docs, Microsoft Word, and Chrome extensions, making it easy for teams to maintain authenticity across all business communications. Its professional focus makes it highly reliable for marketing, legal, and corporate teams.
Top Features & Working:
- Enterprise-grade AI detection for businesses
- Integrates with Docs, Word, and workplace tools
- Highlights AI-generated sections in text
- Secure and compliant with enterprise standards
- Simple and clean reports for professional use
Website: https://writer.com/
Pricing:
| Starter | Enterprise |
| $29/mo | Available on request |
12. Undetectable AI
Undetectable AI is a special site that not only detect AI-made writing but also assists in making it sound more natural. Content creators, students, and professionals who prefer having their work pass AI detection tests but retain a natural sound use the widely popular. The markov tool employs highly sophisticated rewriting algorithms to minimize AI-like structures like low burstiness or excessively predictable word selection.
The unique feature of Undetectable AI is that it does its task not just by identifying AI-written texts but also by rewriting them in a manner that resembles human speech. This would be especially beneficial to freelancers, bloggers and academic users who may wish to enhance the originality of their work without sacrificing their clarity. Its intuitive interface and quick results have rendered it as a favourite amongst many in 2025.
Top Features & Working:
- Detects AI-written content with probability scores
- Humanizes text to bypass AI detection
- Adjusts tone, style, and sentence variation
- Useful for students, writers, and marketers
- Quick, web-based tool with simple usability
Website: https://undetectable.ai/
Pricing:
- $19/mo
13. Kazan SEO AI Detector
Kazan SEO is an SEO optimization kit first of all, but it also has a useful AI content detector. This is an aid aimed at bloggers, digital marketers, and SEO specialists who wish to avoid getting their articles flagged as fake by AI detectors prior to publication. It effectively differentiates between human and AI content by examining the structure of the sentence, grammar, and predictability of the words. As one of the reliable AI SEO tools, it enhances the content creation and optimization process for professionals.
Another distinctive feature of the Kazan SEO AI detector is that it is a part of the SEO process. Users are able to edit their work using AI as a writing tool, optimize it to be better ranked by search engines, and refine their keywords—all on the same platform. This has rendered it a great option in businesses whose operations heavily depend on content marketing.
Top Features & Working:
- AI content detector integrated with SEO tools
- Highlights AI-generated sentences for editing
- Useful for bloggers, marketers, and SEO agencies
- Provides SEO optimization suggestions alongside detection
- User-friendly and lightweight interface
Website: https://kazanseo.com/
Pricing:
- Available on request
14. Turnitin AI Detector
Turnitin has been used for a long time when it comes to detecting plagiarism in schools and universities, and now it has extended to include AI content detection. Specifically, Turnitin AI Detector is designed with academic cheating in mind and assists an educator with determining whether an essay or an assignment (or a research paper) were composed with the help of the AI ChatGPT or Bard.
The detector produces extremely detailed reports with probability ratings, sentence-by-sentence analysis and references to original sources in the event of plagiarism collocation. Today Turnitin is a well-implemented platform in higher education, so its AI detection can easily fit into current academic processes, making it an acceptable solution in the academic environment.
Top Features & Working:
- Academic-grade AI detection for schools and universities
- Integrated with plagiarism detection system
- Sentence-level analysis with confidence scores
- Trusted by educators worldwide
- Seamless integration with existing Turnitin software
Website: https://in.turnitin.com/solutions/topics/ai-writing/ai-detector/
Pricing:
- Available on request
15. AI Detector Pro
AI Detector Pro is a modern AI content detection platform designed for both individuals and organizations that need reliable text analysis. It provides clear reports that show whether text is human-written or AI-generated, along with percentage-based scores for easy interpretation. Its simple interface makes it accessible for students, educators, bloggers, and professionals who want quick results without technical complexity.
One of the biggest strengths of AI Detector Pro is its real-time scanning ability, which allows users to check content instantly before publishing or submitting it. It also supports multiple document types, making it a versatile option for academic, business, and online use. With continuous updates to keep up with evolving AI models, it remains a trustworthy solution for maintaining originality.
Top Features & Working:
- Percentage-based AI detection scoring
- Supports multiple file types (DOC, PDF, TXT)
- Real-time scanning for instant results
- Easy-to-use interface for all user levels
- Regular updates to detect new AI models
Website: https://aidetector.pro/
Pricing:
| Free | Basic | Unlimited |
| $0 | $13.99/mo | $24.99/mo |
Comparison Table of AI Content Detection Tools
| Tools | Top Features & Working | Website | Pricing |
| Originality.AI | Detects GPT, Bard, Claude; plagiarism check; team collaboration; API integration; continuous updates | Originality.AI | Pro $12.95/mo; Pay-as-you-go $30/mo; Enterprise $136/mo |
| GPTZero | Uses perplexity & burstiness; bulk upload; sentence-level highlighting; multi-model support | GPTZero | Essential $8.33/mo; Premium $12.99/mo; Professional $24.99/mo |
| Winston AI | High accuracy with percentage scores; multilingual; document scanning; sentence highlighting; team accounts | Winston AI | Available on request |
| Copyleaks AI Detector | Detects AI across models; enterprise security; LMS integration; sentence detection; API access | Copyleaks | Personal $13.99/mo; Pro $74.99/mo |
| ZeroGPT | Free; percentage-based AI vs human; sentence highlighting; multiple file formats; simple interface | ZeroGPT | Free |
| QuillBot AI Detector | Probability scoring, AI section highlighting; fast scanning; integrates with QuillBot tools | QuillBot | Free; Premium $4.17/mo; Team (on request) |
| Sapling AI Detector | Real-time detection, CRM integration, AI detection for enterprises, and multilingual assistance | Sapling AI | Free; Pro $25/mo; Enterprise (on request) |
| Hive Moderation AI Detector | Enterprise-grade detection; API integration; detects multiple models; scalable; probability analysis | Hive Moderation | Available on request |
| DetectGPT | Probability-based detection; Stanford research; detects subtle patterns; academic/pro use | DetectGPT | Essential $15/mo; Pro $29/mo; Team $59/mo |
| CrossPlag AI Detector | Human-to-AI probability score; plagiarism + AI detection; high privacy; multilingual | CrossPlag | Free |
| Writer.com AI Detector | Enterprise-grade detection; integrates with Docs, Word; highlights AI; secure & compliant | Writer.com | Starter $29/mo; Enterprise (on request) |
| Undetectable AI | Detects AI; rewrites to humanize text; adjusts tone & style; useful for creators | Undetectable AI | $19/mo |
| Kazan SEO AI Detector | AI detection integrated with SEO tools; highlights AI; SEO optimization; easy interface | Kazan SEO | Available on request |
| Turnitin AI Detector | Academic AI detection; plagiarism integration; sentence-level analysis; trusted in education | Turnitin | Available on request |
| AI Detector Pro | Percentage-based scoring; supports DOC, PDF, TXT; real-time scanning; regular updates | AI Detector Pro | Free; Basic $13.99/mo; Unlimited $24.99/mo |
Conclusion
In conclusion, knowing whether the stuff you’re reading—or publishing—was created by a human or a machine is more crucial than ever because the amount of AI-generated content is growing daily. AI content detectors are very helpful in this situation. They support the preservation of uniqueness, safeguard credibility, and guarantee adherence in digital publishing, business, and education.
These detectors provide you with the assurance that your material is genuine, whether you’re a blogger trying to rank on Google, a corporation confirming brand content, or a teacher reviewing student work. You may achieve the ideal balance between the usefulness of AI and the importance of human creativity by employing them sensibly.
FAQs
1. How Accurate are AI Content Detection Tools?
Most detectors provide a fairly high accuracy rate, but none are 100% perfect. Their effectiveness depends on how advanced the AI writing model is and how frequently the detector updates its algorithms.
2. Can AI Content Detectors be Fooled?
Yes, in some cases, advanced AI writing combined with heavy human editing can reduce detection rates. However, detectors are constantly improving to recognize newer AI models and writing styles.
3. Who Can Benefit From Using AI Content Detection Tools?
Educators, students, publishers, content creators, marketers, and businesses can all benefit from these tools. They help verify originality, maintain quality, and build reader trust.
