AI detectors
Tools that estimate whether a text was written by a model — and what their verdict is actually worth.
- GPTZeroEstimates whether a text was written by AI.
- Originality.aiAI detection, plagiarism and fact checking for publishers.
AI detectors: what to know
Detectors give a probability, not a fact. They are useful as one signal among several and harmful when treated as proof, because clean, simple writing by a human can score as machine-written.
Publishers use them alongside plagiarism and fact checks, which is the sensible way: a flagged text is a reason to look closer, never a conclusion on its own.
How to choose
- Never make a decision about a person on a detector score alone.
- Test the tool on text you know is human before trusting it on text you do not.
- For publishing, plagiarism and source checks matter more than AI detection.