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Duden Mentor vs Linguix: catalog facts
Duden Mentor	Linguix
Free The online spelling check can be used free of charge.	Freemium Free to start, with team features offered on top.
Web	Web, Browser extension
Backed by the Duden reference for German spelling Runs in the browser with nothing to install	Works on websites across browsers through an extension Grammar and spell checking in seven languages with automatic detection
German language only Requires an internet connection	Needs an account to use Text is processed by an online service
Web application	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 26, 2026

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