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Quetext vs Copyleaks: catalog facts
Quetext	Copyleaks
Freemium A free option and a free Chrome extension, with fuller features on paid plans.	Paid A commercial service; the homepage directs organisations to request a demo.
Web, Browser extension	Web
Plagiarism and AI detection in one place Citation generator and grammar checker included	Detects both plagiarism and AI-generated text Checks source code for plagiarism
AI detection results are probabilistic and can be wrong Text is checked on Quetext's servers	Aimed mainly at institutions and businesses AI detection results are probabilistic and can be wrong
Web application, Browser extension	Hosted service
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.