Most language apps that I've tried only show text and let you answer questions, some also have a reader that reads the words out loud. This is the only app that I've found that uses voice recognition to test your verbal skills. The graphics are really neat and make make it hard for you to stop
The flashcards are very useful as you remember something much better when you see a picture of it, for example objects like a house, pen, etc.

The app is for:
• English speakers learning Spanish or German
• Spanish speakers learning English or German
• German speakers learning Spanish or English

Here is the link: