LinDuo offers structured language courses covering multiple skills such as vocabulary, phrases, reading, listening, and writing, with the ability to focus on any individual skill. The app uses an enhanced spaced‑repetition algorithm to prioritize review of difficult material, and includes flashcards, various question types, and offline access. Gamified elements like word games, leaderboards, achievements and daily reminders aim to keep learners motivated. Users can customize translations, difficulty level, audio accents and visual settings, and the app tracks progress with detailed statistics.