mm Graph is a free graph plotting app that helps students plot X-Y data on a millimeter-division graph paper. The app guides users step by step in marking data points on the graph paper, along with showing all relevant calculations. It is an excellent tool for students who find it difficult to plot data on millimeter-division graph paper.

The app has a pro version, mm Graph Pro, which offers additional features like drawing graphs anywhere on the mm-division graph-paper by shifting the origin, modifying X and Y axis variables, inserting text and arrow annotations, and recording details of lab assignments related to the plotted graph. You can also import data already saved in files in your device into the app in different formats and different layouts.

With mm Graph Pro, you can plot up to five sets of data, plot as many data points as you wish, and even edit X-Y values for a data point or delete a data point from the graph and replot. The app allows you to orient the graph paper vertically or horizontally for an optimum plot and save the full-sized e-graph with the plotted data into your mobile device.

In conclusion, mm Graph is an excellent app for students and teachers alike, and the Pro version offers a comprehensive set of features for those who need to accomplish more with the app.