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ZeroGPT vs Undetectable AI: catalog facts
ZeroGPT	Undetectable AI
Free The AI detector is offered free on the website.	Freemium Free to use in the browser, with business plans offered.
Web	Web, Browser extension
Free AI text detection in the browser Also checks images and video for AI generation	AI text detection with sentence-level highlighting Rewriter for stiff or machine-sounding text
AI detection results are estimates and can be wrong Text is sent to an online service	AI detection results are estimates and can be wrong Using the humanizer to pass off AI text may breach academic or workplace rules
Web application	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.