Charts
Use the DevExpress Charts for Xamarin.Forms to represent data as bars, pies, areas, lines, etc. It supports the Xamarin.Forms and allows you to create native iOS and Android applications in C#.
How to: Add DevExpress Charts to your Xamarin.Forms solution
Pie Chart
The DevExpress Pie Chart View allows you to visualize your data as a Pie (Circular) chart.
Cartesian Chart
The DevExpress Chart View allows you to visualize your data as a Cartesian (XY) chart.