Which language learning app first introduced a 'streak' feature that gamified daily practice and significantly increased user retention rates?

Customer loyalty programs aren't just for coffee shops and airlines! In the language and linguistics industry, various companies have implemented innovative loyalty systems to encourage continued language learning or translation service usage. This poll tests your knowledge about how language-focused companies have revolutionized customer retention through creative loyalty programs and technology.

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Duolingo
Babbel
Rosetta Stone
Memrise