Which language learning app first introduced the concept of a virtual language learning mascot that adapts to user progress, creating a personalized learning companion?

In the world of language learning apps, branding and product innovation are crucial for market differentiation. One company revolutionized language learning through a groundbreaking mascot and brand strategy that completely changed user engagement patterns. This trivia question tests your knowledge of significant product innovations in the language learning industry that created new market segments.

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Duolingo with its adaptive owl mascot Duo
Babbel with its language chameleon companion
Rosetta Stone with its virtual language guardian
Memrise with its adaptive memory guide character