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Smodin vs Undetectable AI: catalog facts
Smodin	Undetectable AI
Freemium Free to try, with paid plans for heavier use.	Freemium Free to use in the browser, with business plans offered.
Web	Web, Browser extension
Several writing tools in one place Accepts uploaded Word, PDF and text files	AI text detection with sentence-level highlighting Rewriter for stiff or machine-sounding text
AI detection scores are estimates and can be wrong Humanizer output may conflict with school or publisher rules	AI detection results are estimates and can be wrong Using the humanizer to pass off AI text may breach academic or workplace rules
Web application	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
No 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.