Sale has ended but you can still get this app.
Download Graph Now
Graph

Official Description

-Write y(x), r(theta), or x(u);y(u) function to plot, and type your data to display it in the graph.
-curve (Gauss, polynomial) fitting.
-It's simple and easy.
-User can change the color, resolution, and x-limit.
-User can save the graph as a screenshot file.