Which language learning platform revolutionized linguistic product packaging by introducing a 'streak' system that gamified daily practice and significantly increased user retention?

Product packaging extends beyond physical items to how language products and services are presented to consumers. In linguistics and language learning platforms, packaging plays a crucial role in attracting and retaining customers. From language learning apps to translation services, the way linguistic products are marketed significantly impacts consumer perception and adoption. This trivia question explores an interesting aspect of linguistic product packaging that changed industry standards.

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Duolingo
Rosetta Stone
Babbel
Memrise