GPTZero

GPTZero is a professional AI content detection tool whose core function is to distinguish human-created text from AI-generated text. It can accurately identify content produced by mainstream models such as ChatGPT, GPT-4, Gemini, etc., and is widely used in education, content review, and other fields to maintain originality and academic integrity.

According to official data, its overall detection accuracy is about 95.7%, with recognition rates for models like GPT-4 exceeding 99%. However, note that detection reliability may decline for heavily revised, non-native English, or highly structured texts; it is recommended as an initial screening tool and to be used in conjunction with human judgment.

GPTZero offers a free version with a monthly quota of 10,000 words for detection. If higher quotas or advanced features (such as batch processing or API integration) are needed, a paid subscription is available: Essentials around $10 per month, Premium around $14.99–$16 per month.

It supports detecting text generated by mainstream large language models including ChatGPT, GPT-3/4, Gemini, Claude, Bard, and Wenxin Yiyan (ERNIE Bot), and can identify content produced by a mix of humans and AI.

GPTZero emphasizes privacy protection; the text uploaded by users is used only for detection analysis and will not be used to train models or shared with third parties. For sensitive content, please refer to its specific privacy policy terms.

In addition to direct access via the official website, it also offers a free Chrome browser extension, Google Docs add-on, and Microsoft Word add-in, making it convenient to integrate across platforms. An API is also available for developers.