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Copyleaks vs Winston AI: catalog facts
Copyleaks	Winston AI
Paid A commercial service; the homepage directs organisations to request a demo.	Freemium Free to start with no credit card required; paid use and sales-led plans are offered.
Web	Web
Detects both plagiarism and AI-generated text Checks source code for plagiarism	Detects text from ChatGPT, Claude, Gemini and other models Plagiarism checking in the same tool
Aimed mainly at institutions and businesses AI detection results are probabilistic and can be wrong	AI detection results are estimates and can be wrong Full use requires an account
Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
Account 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.