Which language learning subscription service first introduced the concept of 'spaced repetition algorithms' to customize vocabulary learning based on individual memory patterns?

Language learning has undergone dramatic transformations with the rise of subscription-based platforms. These services have not only changed how people access language education but have also introduced innovative approaches to vocabulary acquisition, pronunciation practice, and grammar mastery. This poll tests your knowledge about a groundbreaking subscription model that changed the language learning landscape forever.

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Duolingo Plus
Rosetta Stone Unlimited
Memrise Pro
Babbel Premium