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Duolingo vs Busuu: catalog facts
Duolingo	Busuu
Freemium Free courses, with paid subscriptions including Duolingo Max and a one-week free trial.	Freemium Free to start, with a paid subscription for full access.
Android, iOS, Web	Android, iOS, Web
Short lessons that fit into a few minutes a day Habit-building features such as streaks and reminders	Feedback from a community of native speakers Pronunciation feedback in speaking practice
AI features of Max require a paid subscription Game-like format is lighter than a structured course	Full course access requires payment Proprietary service that needs an account
Downloadable app, Web application	Downloadable app, Web application
Closed source	Closed source
License not stated	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 September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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