my girlfriend and I developed a language app to learn German, Spanish and Thai. It includes around 1000 phrases and words, a quiz and intelligent flashcards:
Learn Thai: http://simplylearnlanguages.com/
Learn German: http://simplylearnlanguages.com/german/
Learn Spanish: http://simplylearnlanguages.com/spanish/
There is an Android version and we are currently developing the iOS version.
I attached some sample screenshots. What do you guys think of it? Would be happy to hear some feedback