Originality.ai

Originality.ai detects text generated by GPT, Claude, Gemini, and other models with high reported accuracy, built for publishers and agencies that need to verify submitted work is actually human-written, plus a plagiarism checker and readability score bundled in. It's one of the more widely used detectors in the content industry specifically, though — like every AI detector — it should be treated as a signal rather than a definitive verdict.