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GPTZero vs Winston AI: catalog facts
GPTZero	Winston AI
Freemium Free scans up to 10,000 characters, with paid upgrades for advanced features.	Freemium Free to start with no credit card required; paid use and sales-led plans are offered.
Web, Browser extension	Web
Sentence-level highlighting rather than a single score Writing replay in Google Docs shows how a document was produced	Detects text from ChatGPT, Claude, Gemini and other models Plagiarism checking in the same tool
AI detection is probabilistic and can misclassify human writing Free scans are limited in length	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 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.