Among the best language learning tools

Among the best, if not the best app on AppStore for language learning. I can only speak for the Spanish course, but it is fantastic. Why? Unlike f.ex. Duolingo, this app EXPLAINS everything about the grammar, teaches with many types of tests and motivates you by showing your level (A1 to B2).
I really love the fact that the community can also check your grammar. Insanely awesome! Me gusta!

Jalarkar about Busuu: Language Learning, v9.2