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Copyleaks vs Undetectable AI: catalog facts
Copyleaks	Undetectable AI
Paid A commercial service; the homepage directs organisations to request a demo.	Freemium Free to use in the browser, with business plans offered.
Web	Web, Browser extension
Detects both plagiarism and AI-generated text Checks source code for plagiarism	AI text detection with sentence-level highlighting Rewriter for stiff or machine-sounding text
Aimed mainly at institutions and businesses AI detection results are probabilistic and can be wrong	AI detection results are estimates and can be wrong Using the humanizer to pass off AI text may breach academic or workplace rules
Hosted service	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 October 2, 2026

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