Which language learning app was the first to implement spaced repetition algorithms with adaptive learning technology at scale, launching in 2007 and revolutionizing digital language acquisition?

The linguistics and language technology industry has seen remarkable innovations that have transformed how we communicate and learn languages. From early machine translation attempts to today's sophisticated AI language models, the journey has been fascinating. This trivia question focuses on a pivotal product launch that changed the landscape of language learning technology. Test your knowledge about this industry milestone!

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Duolingo
Anki
Rosetta Stone Digital
Babbel