TwoToJazz is a free app, with 4 feature bundles that you can unlock by purchasing them via In-App Purchase. In the help/store section of the app you can try these features inside a mini-canvas before unlocking them. The bundles are:
+ Jazzy Brushes
+ Artsy Brushes
+ Advanced Edit and Animate Tools
+ Mix Color
+ Unlock All TwoToJazz Features
The help section of TwoToJazz also provides you direct access to its website and to its YouTube Channel with all TwoToJazz demo and tutorial videos.