Which language learning app pioneered the 'streak maintenance' customer loyalty program that has since been widely adopted across educational platforms?

Language services have undergone dramatic transformation in recent years, with major brands competing for market share through innovative approaches to customer loyalty. This trivia question explores how one particular language service provider revolutionized its business model through an unexpected loyalty program that changed industry standards. Test your knowledge of how language brands connect with their customers beyond traditional service offerings!

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Duolingo, with its system allowing users to maintain daily learning streaks and earn virtual currency (gems) for consistent engagement
Babbel, with its 'language maintenance score' that rewards users with premium content access based on weekly engagement patterns
Rosetta Stone, with its 'fluency points' system that unlocks additional language modules after consistent daily practice
Memrise, with its 'language momentum' feature that provides subscription discounts for users maintaining unbroken monthly learning records