Medical information reference and educational tools are the largest classes of medical apps now. Their percentages in the medical category are 33.75% and 23.75% respectively. How to best present the information to make it easier for end users to understand
is key for these apps. The review of the current top apps shows that visualizing data using 2D charts or 3D views was an approach favored by users. As discussed in Section 4, the media layer in iOS provides the 2D/3D visualization support for applications. Developers can use Open GL ES or native rendering such as Quartz, Core Animation, and UIKit to implement data visualization.