Which language learning platform pioneered the 'freemium' subscription model with a gamified approach that helped it reach over 500 million users worldwide?

The language learning and linguistics software market has transformed dramatically in recent years, with subscription models revolutionizing how people access language tools. From traditional CD-ROMs sold at retail to sophisticated AI-powered apps with recurring revenue models, this industry exemplifies the broader shift in software monetization. Test your knowledge about how subscription models have shaped the linguistics technology landscape!

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Duolingo
Rosetta Stone
Babbel
Memrise