Which language learning app famously launched with the marketing slogan 'The free language-learning app that actually works'?

When major language products and services launch, their marketing often employs fascinating linguistic strategies. This poll explores how language companies have used language itself as a powerful marketing tool during their pivotal product launches. From clever wordplay to linguistic innovations, these launches demonstrate the meta-nature of marketing language products with language itself.

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Duolingo
Babbel
Rosetta Stone
Memrise