Which language learning product was the first to introduce adaptive spaced repetition algorithms in its mobile app, revolutionizing vocabulary acquisition?

In the world of language learning products, innovation has transformed how people acquire new languages. From basic phrasebooks to sophisticated AI systems, companies have continuously pushed boundaries to make language acquisition more accessible and effective. This poll tests your knowledge about a groundbreaking product launch that changed how we think about language learning technology.

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Duolingo (2012)
Anki (2006)
SuperMemo (1991)
Rosetta Stone Mobile (2010)