Excellent app!!
If you are learning Chinese you need this app. It's very interactive and has very detailed explanations of each character, making it easier to remember each one. It breaks you in very easily before getting quite heavy around the fifth unit. The tests are excellent and use good examples of the newly learned characters to get you used to seeing them used normally. I use this with a little Chinese character writing book for extra practice and I can read more and more Chinese now. Buy this app if you are serious about studying Chinese and you will never look back.