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DL: language lessons vs Duolingo: catalog facts
DL: language lessons	Duolingo
Free The client is free and open source under GPL-3.0; Duolingo's own plans apply.	Freemium Free courses, with paid subscriptions including Duolingo Max and a one-week free trial.
Linux	Android, iOS, Web
Dedicated window for Duolingo on Linux Blocks common trackers	Short lessons that fit into a few minutes a day Habit-building features such as streaks and reminders
Unofficial and not affiliated with Duolingo Only wraps the web app, so it needs an internet connection to Duolingo	AI features of Max require a paid subscription Game-like format is lighter than a structured course
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 September 23, 2026

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