I moved from France to Greece, then to the Netherlands and Germany, and had to learn new languages as an adult. Apps didn't help much: Duolingo and the like teach synthetic sentences, not the language people actually speak.
What worked for me was immersion, and today there's endless short-form video in every language. So I built Club Yap, an app that helps you learn a language through real short videos of native speakers.
getclubyap.com →