Mondly is a language learning app that enables users to learn 33 languages for free and it is used by 40 million people in over 190 countries. The 33 languages are British English, American English, Spanish, French, German, Italian, Russian, Japanese, Korean, Chinese, Turkish, Arabic, Persian, Hebrew, Portuguese, Dutch, Swedish, Norwegian, Danish, Finnish, Greek, Romanian, Afrikaans, Croatian, Polish, Bulgarian, Czech, Hungarian, Ukrainian, Vietnamese, Hindi, Indonesian. There is the free content and the premium content of Mondly. The free content is obviously much more limited compared to the premium one as you don't have to pay money; however, there is still enough content for you to be able to the basic vocabulary of any of the listed languages. Personally, I would only recommend Mondly for vocabulary learning unless you decide to get the premium version of the app, which also includes the grammatical aspect of language.