GPTZero
AI detector aimed at educators and students, with sentence highlighting and writing-process tools.
- Free tier
- Paid plans
- Educators
Other AI detectors
No single AI detector is reliable on its own. Checking a passage with more than one tool gives a better picture — and you'll often find the results disagree. Here are other detectors you can use alongside ChatZero, listed in no particular order of quality.
ZeroGPT
Free web AI detector with paid higher limits.
- Free tier
- Paid plans
QuillBot AI Detector
Free AI detector from the QuillBot writing-tools suite.
- Free tier
- Writing tools
Turnitin (official)
The AI writing detection built into Turnitin, available through schools and institutions, not directly to individuals.
- Institutions only
- Educators
Copyleaks
AI and plagiarism detection for education and business.
- Paid plans
- Education
- Business
Originality.ai
Paid AI and plagiarism checker aimed at publishers and content teams.
- Paid plans
- Publishers
Scribbr AI Detector
Free AI detector from the academic writing service Scribbr.
- Free tier
- Students
Grammarly AI Detector
Free AI detector from Grammarly.
- Free tier
- Writing tools
Sapling AI Detector
Free AI detector from Sapling.
- Free tier
Winston AI
Paid AI detector for education and publishing.
- Paid plans
- Education
- Publishers
TurnitinDetector.ai
Independent third-party checker.
- Independent — not affiliated with Turnitin
How ChatZero is different
- Runs entirely in your browser.
- Your text is never uploaded.
- Free, with no sign-up.
- Uses an open-source detection model.
We're not affiliated with any of these services. Names are trademarks of their respective owners. Listing is for information only and isn't an endorsement.