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Duolingo vs DL: language lessons: catalog facts
Duolingo	DL: language lessons
Freemium Free courses, with paid subscriptions including Duolingo Max and a one-week free trial.	Free The client is free and open source under GPL-3.0; Duolingo's own plans apply.
Android, iOS, Web	Linux
Short lessons that fit into a few minutes a day Habit-building features such as streaks and reminders	Dedicated window for Duolingo on Linux Blocks common trackers
AI features of Max require a paid subscription Game-like format is lighter than a structured course	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 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.