GPTZero

GPTZero is a real, functioning product with genuine scale — millions of users, campus deployments, and a battery of integrations that go well beyond a single-purpose AI checker. Its core detection engine appears to be a legitimately trained proprietary model rather than a thin ChatGPT wrapper, and the added hallucination/plagiarism/authorship features show real product investment. That said, the fundamental technology category — AI-text detection — carries structural reliability limits that no vendor has fully solved: false positives on paraphrased, ESL, or heavily edited human writing remain a live risk, and the page leans on curated testimonials and self-reported benchmark numbers rather than independently reproducible accuracy data for the reader to verify. For educators and institutions this is one of the more credible options in a crowded and often overhyped category, but it should be used as a signal for conversation, not as a verdict of guilt.