Which language learning brand first popularized the use of 'spaced repetition algorithms' as their core product differentiator in their marketing strategy?

In the world of language products and services, brand positioning through linguistic innovation has shaped how companies differentiate themselves in a crowded market. From language learning apps to translation services, companies have used unique linguistic approaches to carve their niche. This trivia question explores how one major language brand strategically positioned itself through a distinctive linguistic feature that became central to their identity.

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Duolingo
Rosetta Stone
Anki
Babbel