Most brands make you pick between looking good and performing well, Nike manages to do both. The design language is clean, and the products actually work.
No other app has the same mix of tracking + community. Strava makes every run feel connected, seeing friends activities, giving kudos, and comparing routes keeps people motivated in a way other apps never did.
Duolingo actually makes language learning fun. The streaks, gamification, and quick lessons make it easy to stay consistent, which is where every other app falls short.