According to Duolingo’s blog article “The top 5 mistakes that Spanish learners make”, It's very common for learners—especially those whose language doesn't have this sort of grammatical gender—to struggle not just with the gender of the noun but also with matching gender across all the necessary words. This indicated that a feature focused on gender could be valuable. Inspired by popular dating apps like Tinder, the exercise would present users with nouns in a swipeable format. Users would swipe left for masculine nouns (EL) and swipe right for feminine nouns (LA), mimicking the familiar gesture-based interaction of dating apps.