Peer-reviewed journal “Foreign Language Annals” published a Duolingo study, showing that completing five units in Duolingo’s Spanish and French courses is comparable to four university semesters for reading and listening skills. What’s more, Duolingo learners achieved four semesters of proficiency in reading and listening in less than half the time as their college counterparts.
Pros:
Visual revision reminders
Beautiful interface
Free and fun courses
Visual learning with images and visual prompts
Game-like lessons keeps users motivated and on track
Science-based teaching methodology
Be a part of language community
Cons:
No control over the vocabulary topics, the order they come in, and the ability to skip them
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