Which language learning platform or linguistic tool famously used the slogan 'The free language-learning app that actually works'?

Brand slogans are powerful linguistic tools that companies use to create memorable identities. Behind every successful slogan is careful linguistic consideration—from phonetic patterns to semantic associations. This trivia tests your knowledge about famous language-related brand slogans that have made significant cultural impacts or demonstrated interesting linguistic principles. Can you identify which famous language learning platform or linguistic tool used the following slogan?

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Duolingo
Rosetta Stone
Grammarly
Babbel