Which language learning company was the first to introduce a subscription model that used spaced repetition algorithms and grew to over 500 million users worldwide?

The language learning industry has transformed dramatically with subscription models replacing traditional one-time purchase dictionaries and language courses. These subscription services have revolutionized how people learn languages, access translation tools, and study linguistics. Test your knowledge about a major disruption in this industry!

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Duolingo
Rosetta Stone
Babbel
Memrise