Compare software

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