Which language learning app deliberately chose green as its primary brand color to represent growth, renewal, and the 'fresh start' psychology of language acquisition?

Brand colors aren't chosen randomly—especially in the language learning industry where color psychology plays a crucial role in user engagement and retention. Different language learning platforms strategically select their color schemes to evoke specific emotions and associations. How well do you know the primary brand colors of these major language learning applications and the psychological reasoning behind them?

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Duolingo
Babbel
Rosetta Stone
Memrise