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Babbel vs DL: language lessons: catalog facts
Babbel	DL: language lessons
Paid Sold as a subscription.	Free The client is free and open source under GPL-3.0; Duolingo's own plans apply.
Android, iOS, Web	Linux
Structured lessons with a clear progression Focus on practical conversational language	Dedicated window for Duolingo on Linux Blocks common trackers
Requires a paid subscription No live practice with native speakers described	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
Account 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 September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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