Compare software

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