AI content detectors

How each major AI detector scores your writing — and how to make text read as naturally human. No detector is infallible; they routinely false-flag genuine human writing, so treat every score as a probability, not a verdict.

• GPTZero — The classroom-favorite detector built on perplexity and burstiness.
• Turnitin — The academic-integrity gatekeeper bundled into most LMS submissions.
• Originality.ai — The aggressive, model-specific detector aimed at web content.
• ZeroGPT — The popular free detector — fast, blunt, and easy to trip.
• Copyleaks — Enterprise plagiarism + AI detection with multi-language coverage.
• Winston AI — Accuracy-focused detector with OCR and document support.
• Sapling — API-first detector with sentence-level scoring for products.
• Writer.com — A simple free detector bundled with a content platform.