Which innovative feature, first introduced by Duolingo in 2012, revolutionized language learning apps and has since become standard in most language learning products?

Language learning apps and tools have transformed how we acquire new languages. But launching these products requires deep understanding of linguistic principles, cultural nuances, and educational methodologies. This poll tests your knowledge about one of the most significant product launches in the language learning industry that fundamentally changed how we approach language acquisition technology. Can you identify which groundbreaking feature truly revolutionized the market?

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Spaced repetition algorithms based on the forgetting curve
Voice recognition with regional accent detection
Neural machine translation integration
Augmented reality conversation simulations