Which language learning product first introduced the innovative 'spaced repetition' algorithm in its mobile app to optimize vocabulary retention?

In the rapidly evolving world of language technology, certain products have revolutionized how we communicate and learn languages. This poll tests your knowledge about a groundbreaking linguistic product that changed how millions approach language learning worldwide. Think about popular language learning platforms and their unique innovations that disrupted traditional education methods.

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Duolingo
Anki
Rosetta Stone
Babbel