Best AI Detectors and Plagiarism Checkers

Check whether an essay or article was written by AI, find copied passages and get a report you can share with a teacher or editor.

1. 1

   Grammarly AI

   AI writing assistant for grammar, tone, clarity and style.

   #323 global trafficFreemium · $30/mo (Pro)Free plan
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2. 2

   QuillBot

   AI paraphrasing, summarization and grammar checking tool.

   #3,776 global trafficFreemium · $19.95/mo (Premium)Free plan
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3. 3

   Turnitin

   Plagiarism and AI writing detection used by schools and universities; students submit through their school's learning platform.

   #6,076 global trafficEnterprise · Institutions only
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4. 4

   GPTZero

   AI detector that checks whether text was written by ChatGPT, Claude or Gemini, with sentence highlights, a Chrome extension and reports teachers can share.

   #15,401 global trafficFreemium · $23.99/mo (Premium)Free plan
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5. 5

   SciSpace

   AI research assistant for literature reviews and chatting with papers, with a paraphraser, citation generator and AI detector.

   #15,715 global trafficFreemium · $20/mo (Premium)Free plan
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6. 6

   Duplichecker

   Plagiarism checker with a paraphrasing tool and AI detector, offering free checks and paid word-based plans.

   #18,485 global trafficFreemium · $9.99/mo (20,000 words)Free plan
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