Verdict
Grammarly’s AI Detector benefits from being part of a trusted, well-established platform, but trust alone does not make a reliable detector. My testing revealed a tool that catches AI content inconsistently while handling human-written content reasonably well. If you need a quick, free sanity check on a piece of writing, Grammarly’s detector is easy to access and will not cost you anything. The Pro version adds useful phrase-level highlighting and rewriting tools that could genuinely help writers who want to reduce the AI-like qualities in their drafts.
Have you tested Grammarly’s AI Detector? Share your results and experience in the comments below.