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GPTZero
The industry-standard AI detector for identifying ChatGPT, Claude, and Gemini content. Features sentence-level analysis, plagiarism checking, and authorship verification for educators and pros.
About GPTZero
What the tool does and who it's for
GPTZero is a leading AI detection platform designed to distinguish between human-written and AI-generated text. Originally developed at Princeton University, it identifies content from models like ChatGPT, GPT-4, Claude, and Gemini. Beyond simple scores, it provides sentence-level highlighting, an AI vocabulary checker to spot common machine-learned patterns, and a hallucination detector to verify factual claims. Widely adopted by over 17 million users, including educators and professionals, the platform integrates directly into workflows via a Chrome extension, Google Docs add-on, and LMS platforms like Canvas. Its 'Writing Reports' feature also allows users to prove their authorship through a video-like replay of their writing process.
Key capabilities
Pricing
Freemium — plans below
Free
$0
- Up to 10,000 characters per scan
- Basic AI detection
- Limited batch scans
- Access to Origin Chrome extension
Essential
$15/mo
- 150,000 words per month
- Advanced AI scan
- AI vocabulary check
- Grammar check
Premium
$24/mo
- 300,000 words per month
- Plagiarism checker
- Writing feedback and structural analysis
- Source and generate citations
- Most popular for individuals
Professional
$35/mo
- 500,000 words per month
- Scan up to 250 files at once
- Team collaboration tools
- Enterprise-grade security (SOC 2)
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