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DL: language lessons vs Babbel: catalog facts
DL: language lessons	Babbel
Free The client is free and open source under GPL-3.0; Duolingo's own plans apply.	Paid Sold as a subscription.
Linux	Android, iOS, Web
Dedicated window for Duolingo on Linux Blocks common trackers	Structured lessons with a clear progression Focus on practical conversational language
Unofficial and not affiliated with Duolingo Only wraps the web app, so it needs an internet connection to Duolingo	Requires a paid subscription No live practice with native speakers described
Downloadable app	Downloadable app, Web application
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Account 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 September 23, 2026

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