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Undetectable AI vs Winston AI: catalog facts
Undetectable AI	Winston AI
Freemium Free to use in the browser, with business plans offered.	Freemium Free to start with no credit card required; paid use and sales-led plans are offered.
Web, Browser extension	Web
AI text detection with sentence-level highlighting Rewriter for stiff or machine-sounding text	Detects text from ChatGPT, Claude, Gemini and other models Plagiarism checking in the same tool
AI detection results are estimates and can be wrong Using the humanizer to pass off AI text may breach academic or workplace rules	AI detection results are estimates and can be wrong Full use requires an account
Web application, Browser extension	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 26, 2026

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