Too many ads
Every 20 to 30 seconds theres an ad that pops up. The App Store shows you can buy the ad removal for $.99, but inside the app you can only purchase the VIP package for $9.99. The VIP package is another app that supposed to teach you pronunciation for Chinese words but I downloaded the free trial it doesnt do anything.
Blackbery-12 about
Pinyin Chart - Learn Chinese, v3.5