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Mondly vs DL: language lessons: catalog facts
Mondly	DL: language lessons
Freemium Free to start learning; fuller access is sold separately.	Free The client is free and open source under GPL-3.0; Duolingo's own plans apply.
Android, iOS, Web	Linux
41 languages, learnable from many native languages Daily lessons and topic-based conversations	Dedicated window for Duolingo on Linux Blocks common trackers
Short lessons suit beginners more than advanced learners Pricing for full access is not shown on the homepage	Unofficial and not affiliated with Duolingo Only wraps the web app, so it needs an internet connection to Duolingo
Downloadable app, Web application	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.