#4
Duolingo
37 million daily users. Great for starting, not for finishing.
Its gamification system boosts daily engagement by 80%, but fluency plateaus at B1 level for 65% of users. While effective for building basic vocabulary (like 500 words in 3 months), it underperforms Pimsleur for spoken fluency by 50%. Despite its limitations, Duolingo serves as a strong entry point, with 30% of users later transitioning to Anki or italki for advanced mastery.
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