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Winston AI vs GPTZero: catalog facts
Winston AI	GPTZero
Freemium Free to start with no credit card required; paid use and sales-led plans are offered.	Freemium Free scans up to 10,000 characters, with paid upgrades for advanced features.
Web	Web, Browser extension
Detects text from ChatGPT, Claude, Gemini and other models Plagiarism checking in the same tool	Sentence-level highlighting rather than a single score Writing replay in Google Docs shows how a document was produced
AI detection results are estimates and can be wrong Full use requires an account	AI detection is probabilistic and can misclassify human writing Free scans are limited in length
Web application	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Account 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 September 26, 2026

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