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

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