Which language learning app broke product launch records by using a linguistic phenomenon called 'the streak effect' to drive unprecedented user retention?

Test your knowledge about famous product launches in the language technology industry! The way companies introduce linguistic tools and translation software to the market often reveals fascinating insights about language evolution, cultural considerations, and technical innovation. This poll explores how major language technology products were brought to market and the linguistic strategies behind their successful launches.

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Duolingo, which gamified language learning with a 'streak counter' that tapped into loss aversion psychology
Babbel, which pioneered the use of spaced repetition algorithms tied to daily usage notifications
Rosetta Stone, which launched its immersion method with a 30-day consecutive usage challenge
Memrise, which introduced community competitions based on daily login achievements