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Duden Mentor vs Eloquent: catalog facts
Duden Mentor	Eloquent
Free The online spelling check can be used free of charge.	Free Free and open source under the GPL-3.0 licence.
Web	Linux
Backed by the Duden reference for German spelling Runs in the browser with nothing to install	Works fully offline Supports more than 20 languages
German language only Requires an internet connection	Linux only Small project with a short commit history
Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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