AI Undetect is a tool that detects AI-generated content and rewrites it to be undetectable by AI detectors. It offers an AI detector and an AI humanizer in one platform. Key features include support for 20+ languages, multiple rewriting modes (General, Academic, Blog, etc.), an auto-perfect mode for high-quality rewrites, and a history feature. The tool helps students, marketers, writers, and researchers ensure their content passes AI detection tests, maintaining authenticity and avoiding false accusations. It provides a free tier with 500 words and 10 detector uses, with paid plans for higher limits and additional features.