I think you are missing the overall picture. Instead of the list of apps, focus on the elements of language learning in general. Eg. if you need to be able to

I think you are missing the overall picture. Instead of the list of apps, focus on the elements of language learning in general. Eg. if you need to be able to communicate with other people in foreign language, the only way to learn such skill is to actually speak with people using the target language. There is no AI good enough to learn you this. You can try to meet some people speaking the language, pay for the teacher, or if there are no such people in your local area, using videoconferencing over the internet. When you figure which case applies to you, then you can try to look for an app to help you with that (eg. https://www.meetup.com/find/language/ https://www.meetup.com/find/language/ for finding local groups or https://www.italki.com/home https://www.italki.com/home for finding a language teacher over internet). It's also important to understand that there is no silver bulet, and many different approaches exists and nobody will tell you what is right exactly for you. That said, you should be trying to focus on list of approaches which are proven to work, and try to figure out which you will use. You can do that by searching for the description of language learning process from people who learned few languages already.