I should have known if the apps free, you’re the product. Duolingo appears to harvest the most data compared to other language learning apps.
Source: Surfshark Research
2 points
Their “Spanish for English speakers” course goes all the way through CEFR B2 proficiency. There’s no way to attain that in a year of HS Spanish unless you were in a Spanish-speaking high school, fully immersed. Some versions of the Spanish course (for other native languages) may not go as far, that’s just the one I’m working on.
