GPTZero
GPTZero is an AI detection platform that scans text for content generated by large language models like ChatGPT, GPT-5, Claude, and Gemini, while also offering writing quality checks, plagiarism detection, and authorship verification. It serves over 17 million users, including 1 million educators, with 99% accuracy reported in independent benchmarks.
Key facts
What is GPTZero?
Preserve what's human by detecting AI-generated text and ensuring authentic writing with the most accurate AI checker on the market.
Who is GPTZero best for?
Teachers, writers, students, recruiters, cybersecurity professionals, ML engineers, academic institutions, hiring organizations
What are its main limitations?
- No AI detector can be 100% perfect; some risk of false positives
- Pricing details not fully transparent on the website
Limitations are based on product materials or editorial synthesis; confirm on the official site.
Key features
- ✓AI Detector: Scans text for AI generation from ChatGPT, Gemini, Claude, Llama, and GPT-4/5
- ✓Advanced AI Scan: In-depth probability analysis with best-in-class accuracy per independent benchmarks
- ✓Hallucination Detector: Detects hallucinated citations and fake academic sources
- ✓Plagiarism Checker: Detects content copied from outside sources without attribution
- ✓Grammar Checker: Corrects grammar and spelling errors
- ✓Authorship Verification: Preserves originality and transparency with writing reports and video replay
- ✓AI Examiner: Provides AI-powered writing feedback trained by domain experts
- ✓Integrations: Chrome, Google Docs, Canvas, API, Zapier
Use cases
- →Teachers verifying student assignments for AI-generated content in Canvas or Google Classroom
- →Writers proving their original authorship and avoiding false AI accusations
- →Students improving their writing and demonstrating authentic work
- →Recruiters screening applicants to ensure human-written responses
- →Cybersecurity teams defending against AI-powered phishing and cyberattacks
- →ML engineers sourcing human-written data for model training
Pricing
Free
$0
- · Basic AI detection scans up to 10,000 characters
- · Grammar and plagiarism checks
- · Access to Chrome extension
Professional
Contact sales
- · Advanced AI Scan
- · Hallucination Detector
- · Authorship Verification with video replay
- · Expert Feedback
- · Higher character limits
- · Priority support
Free plan available; paid Professional plan requires contacting sales; enterprise/team plans also available with custom pricing.
Pros
- +99% accuracy rate in spotting AI-generated text vs. human writing
- +Detects mixed documents (human + AI) with 96.5% accuracy
- +Supports major AI models including ChatGPT, GPT-5, Claude, Gemini, Llama
- +Offers video replay of the writing process for authorship verification
- +Free plan available with basic scanning
Cons
- −No AI detector can be 100% perfect; some risk of false positives
- −Pricing details not fully transparent on the website
Positioning
- Core value: Preserve what's human by detecting AI-generated text and ensuring authentic writing with the most accurate AI checker on the market.
- Ideal for: Teachers, writers, students, recruiters, cybersecurity professionals, ML engineers, academic institutions, hiring organizations
- Product type: Web app, Chrome extension, Google Docs add-on, Canvas integration, API, Zapier integration
Frequently asked questions
What is GPTZero?
GPTZero is an AI detector that identifies text generated by large language models such as ChatGPT, GPT-5, Claude, and Gemini. It also provides writing quality tools like grammar checking, plagiarism detection, and authorship verification.
How does AI detection work?
GPTZero analyzes patterns in text, including perplexity (predictability), burstiness (variation in sentence length and style), and overall tone. Its proprietary model uses hundreds of factors to determine whether text was written by a human or AI.
Is GPTZero’s AI detector accurate?
Yes. Independent benchmarks show GPTZero achieves 99% accuracy in classifying AI vs. human text, with a 95.7% detection rate on RAID benchmark and 96.5% accuracy on mixed documents. It is the most accurate AI detector according to Penn State's AI Research Lab.
How do I use GPTZero’s AI detection tool?
You can paste text or upload a document (up to 10,000 characters on free tier) and click 'Scan'. For longer scans, create a free account. Results show the percentage likely AI-generated and highlight specific phrases.
What integrations does GPTZero offer?
GPTZero integrates with Google Docs, Google Classroom, Canvas, Chrome (extension), Zapier, and provides a powerful API with ready-to-use code in 17 languages such as Node.js, Python, C#, Java, PHP, and more.
Who is GPTZero for?
GPTZero is designed for teachers, students, writers, recruiters, cybersecurity professionals, ML engineers, and any organization needing to verify human authorship and detect AI-generated content.
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