Great app - but as other said, this only works to reinforce what you learn.

My experience learning Japanese is a follows: - learn the sounds - no need to learn the writing ( yet )

- immerse in language and culture - just watch anime and movies as much as possible - I tell you what happens: at some points your brain makes click! and you start seeing the words and the sounds. Nice about the japanese is the very finite sounds they use.

- when I heard the japanese spoken, I started to visualize in my mind vision the romaji , like mental writing -> then I started to replace the romaji with hiragana and now slowly I replace with kanji ( as much as possible , still learning ) so in this way I bring the writing like a transcription service.

Till now speaking is still hard as I am yet to grasp full grammar in expressing complex ideas. Japanese has a beautiful information compression by linking parts of the sentence in ( for now ) complex chains that express ideas. I mean, yes, if I am stranded in Japan, I will survive, but I wont be able to go out with my friends and tell a story. That is still very far away. Maybe this needs reading books.