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