I'm a language learner as well as a teacher.
I don't believe language learning apps can replace tuition where you can ask questions/get personalised feedback, or practise with other speakers of the language, but I do think they're a great way to support your learning, strengthen your language skills, and help you to build your vocabulary.
In this episode, I talk about my experiences of the Duolingo app - which features I find helpful, and which skills are harder to develop with this kind of app.
You can find the show notes page here:
https://englishwithkirsty.com/podcast/episode177