I can’t begin to tell you how many people I’ve directed towards this app! Living in japan I can tell you I’ve used this so many times and have found everything amazing about it.
If anything, may I make two recommendations.
1) give us the option to upload flash card decks into quizlet ( the flash card learning option built in is mediocre to say the least )
2) ability to take a picture of something, highlight the text and get a translation ( or rather just the furigana , basically to be able to upload pictures into the page where we can currently paste large bodies of text )
And that’s it-