Which language learning product innovated its brand identity by incorporating the linguistic concept of 'spaced repetition' directly into its name?

In the world of language learning apps and linguistic products, brand identity is crucial for standing out in a crowded market. Companies often leverage unique linguistic features or phenomena to create memorable brand identities. This poll tests your knowledge about a significant product innovation that revolutionized how language learning products approached brand identity through clever naming strategies.

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Duolingo (named after 'duo' meaning 'two' to represent language pairs)
Anki (named after the Japanese word for 'memorization')
Babbel (named after the Tower of Babel biblical story)
Rosetta Stone (named after the ancient linguistic artifact)