GPTZero

ZeroGPT is an AI-content detection service that tests text for AI-generated or humanized content and reports the percentage detected as AI-generated. Its website describes it as an AI detector and ChatGPT detector for content associated with ChatGPT, GPT-5, and Gemini, with a free checking option.

An AI text humanizer from UndetectedGPT that transforms AI-generated text into writing described as natural and undetectable by AI detectors. The service claims to bypass detectors including GPTZero and Turnitin and offers free humanizing.

Clever AI Humanizer is described as a tool that humanizes test text before the text is evaluated by GPTZero. The available evidence does not specify its developer, interface, distribution, or implementation.

Originality.ai is an AI-content detection service that scans text, including AI-generated writing that has been manually revised, to assess whether it is likely to have been produced by an AI system or written originally by a person. Its website describes it as an AI detector and checker for text generated with systems such as ChatGPT, GPT-5, and Gemini.

WormGPT is a named AI chatbot reported to be designed and marketed for cybercriminal use, offering guidance and code related to malware, phishing, and intrusion techniques. It emerged in reporting from late 2023 and was discussed by cybersecurity firms and in underground forums as an illicitly purposed generative AI service.