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LingoDeer vs DL: language lessons: catalog facts
LingoDeer	DL: language lessons
Freemium Full access to all languages and features is a paid purchase, with multi-year plans…	Free The client is free and open source under GPL-3.0; Duolingo's own plans apply.
Android, iOS	Linux
Grammar-based curriculum written by language teachers Native speaker audio instead of text-to-speech	Dedicated window for Duolingo on Linux Blocks common trackers
Full access requires payment Mobile apps only in the listed downloads	Unofficial and not affiliated with Duolingo Only wraps the web app, so it needs an internet connection to Duolingo
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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