Which language learning app pioneered the 'streak maintenance' subscription model, where users pay to maintain their learning streak when they miss a day?

The language learning app market has exploded in recent years, with different companies employing various subscription strategies to monetize their products. From freemium models with limited features to premium subscriptions offering advanced linguistic tools, these apps have revolutionized how people learn new languages. This poll tests your knowledge of the subscription approaches used by major language learning platforms.

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Duolingo
Babbel
Rosetta Stone
Memrise