Which language learning product launch revolutionized the industry by introducing a spaced repetition algorithm that adapts to individual learning patterns?

In the world of language learning products, some launches have fundamentally transformed how we approach acquiring new languages. This poll tests your knowledge about a revolutionary product launch that disrupted traditional language education methods and created an entirely new market segment. Do you know which innovative language learning platform changed the game with its unique approach to vocabulary acquisition and retention?

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Rosetta Stone's Dynamic Immersion system (1992)
Duolingo's gamified language platform (2011)
Anki's SuperMemo spaced repetition software (1987)
Babbel's speech recognition technology (2008)