Which language learning app deliberately chose green as its primary brand color to symbolize growth, progress, and the 'freshness' of learning a new language?

Brand colors aren't random choices—they're strategic decisions based on psychology and market positioning. In the language learning industry, color schemes play a crucial role in how users perceive the learning experience. Different colors evoke different emotions and expectations. Can you identify which color psychology strategy is correctly matched with a major language learning platform? Test your knowledge of how visual branding intersects with linguistics products!

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Duolingo
Babbel (whose primary brand color is actually blue, representing trust and reliability)
Rosetta Stone (whose primary brand color is yellow, representing optimism and clarity)
Memrise (whose primary brand color is purple, representing creativity and imagination)