Unfox

Unfox is an AI text detector that flags writing likely produced by models such as ChatGPT, Claude and Gemini. It’s designed to give a quick yes/no read on whether a piece of text looks machine-generated, with results returned in seconds.

The detection runs on a proprietary large model that analyses signals like perplexity and burstiness, along with other textual features its makers use to distinguish human and AI writing. The service is presented as having high accuracy, and it aims to catch content that’s been edited or polished after generation.

It supports multiple languages, including Chinese, and the basic checks are free to use without signing up. Paid options are available if you need more volume or features. https://unfox.ai/

• Quick detection for major AI models (ChatGPT, Claude, Gemini)
• Multilingual support, including Chinese
• Proprietary model analysing perplexity, burstiness and other signals
• Free basic use with no registration; freemium paid tiers available