Which language learning platform is known for its marketing campaign emphasizing 'spaced repetition' as its core scientific principle for vocabulary retention?

Test your knowledge of language learning platforms and their distinctive marketing strategies! Language learning apps and platforms have revolutionized how we acquire new languages, with each major brand developing unique approaches to learning, retention, and user engagement. Their marketing campaigns often highlight specific features that set them apart in this competitive industry. Can you identify which marketing claim belongs to which language platform?

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Duolingo
Babbel
Anki
Rosetta Stone