Graph Plotter is a free, versatile graphing tool for Android developed by Philip Stephens. It is a powerful program that allows users to plot graphs of various equations and functions with ease. The program has optimized algorithms that enable scrolling and zooming of all graphs in real-time. The program is a great tool for students, engineers, and professionals looking to plot graphs.

One of the most impressive features of Graph Plotter is the ability to plot graphs of equations with cartesian, polar, spherical, cylindrical, or parametric variables. The program also allows users to draw implicitly defined equations, making it easier to plot complex functions. Users can choose between real/imaginary or modulus/argument output for complex graphs. Additionally, the program gives users the freedom to customize all the graphs' colors.

Another great feature of Graph Plotter is the ability to find intersections and other critical points for 2D graphs. Users can choose between cartesian or polar axis for 2D graphs. The program allows users to save images of the graphs to the phone's gallery for use in projects, presentations, and more.

Overall, Graph Plotter is an excellent graphing tool for Android devices. It is user-friendly and has a wide range of features that make it a must-have for anyone looking to plot graphs on their Android device.