The developer 50 languages has developed the app for the people who are interested to make their linguistic knowledge better by learning some more languages than the essential ones only. Learn 50 languages is a free app and you can really learn 50 languages from this app. You will be provided with 100 lessons altogether, which will introduce you with the basic vocabularies of the languages but free version includes 30 lessons, the rest you will get by upgrading the version.
The 100 lessons will help you in learning the languages very fast as you will get the language combinations also with it. The audio files you can get also with the app which is free to download. Study the language, learn it properly, listen to it to make the spoken sense better, practice it wherever you like and sooner you will be the language expert of 50 languages!