Which language learning product launch in 2012 first introduced adaptive spaced repetition algorithms paired with native speaker pronunciation analysis?

The language learning industry has seen numerous innovative product launches that transformed how we approach language acquisition. Some launches were particularly groundbreaking, combining cutting-edge technology with linguistic science to create entirely new learning paradigms. This trivia question tests your knowledge of a significant milestone in language learning product history that fundamentally changed the market landscape.

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Duolingo's public release, which primarily focused on gamification but didn't include adaptive spaced repetition or pronunciation analysis at launch
Babbel's Neural Accent System, which analyzed pronunciation but didn't incorporate adaptive spaced repetition until 2015
Rosetta Stone's TOTALe PRO, which pioneered the combination of adaptive learning algorithms with real-time pronunciation feedback technology
Memrise's initial app, which used spaced repetition but didn't add pronunciation analysis capabilities until their 2014 platform update