Which language learning platform pioneered the subscription-based 'freemium' loyalty model that revolutionized the language education retail market in the 2010s?

The intersection of retail technology and linguistics has transformed how we interact with language products and services. From digital dictionaries to language learning apps, technology has revolutionized the accessibility and delivery of linguistic tools. This trivia question explores how major language learning platforms have adapted their brand strategies to changing consumer expectations and technological capabilities over time.

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Duolingo - with its gamified approach and streak-based retention system
Rosetta Stone - with its immersion methodology subscription service
Babbel - with its conversation-focused membership program
Memrise - with its memory technique-based premium tier