Underwhelming and expensive
I would give the free part of the app 2 stars and the additional 'anatomy' feature 1 star. Hence 2 stars overall. The free part is basically providing audio of every possible sound in Chinese. Underwhelmingly presented, but also fine, I guess. However, $12.99 is far too much to pay for the 'anatomy' feature. Please save your money people. The idea of the 'anatomy' feature is to show you how to make every possible Chinese sound via an animated infographic of the mouth. The idea is good, but the execution of the infographics is underwhelming and don't actually help. Take for example the 'r' sound and 'zh' sounds; the infographics do not show enough detail to teach you the differences between these sounds. The images look basically the same, and there is a very loose description in text. For $12.99, I'm sorry but you should do a lot more that this.