Which innovative product feature did Duolingo pioneer that revolutionized language learning app retention?

Duolingo has revolutionized language learning through gamification and innovative product design. Behind its playful owl mascot and game-like interface lies sophisticated linguistic technology and teaching methodologies. This poll tests your knowledge of how product innovation in language learning apps has transformed an academic pursuit into an engaging daily habit for millions worldwide.

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Streak system with daily reminders and rewards
Voice recognition technology for pronunciation feedback
Subscription-based premium content tiers
Peer-to-peer conversation practice with native speakers