Click on the screen to create a point. Make up to 5 clusters out of these points. Then press calculate. It will take around 10 seconds. The program attempts to find the clusters you drew. You can then manually adjust how many clusters there are if it doesn’t seem right. Enjoy!
Uses k-means clustering. First, it clusters the points with random starting values. It repeats a bunch of times with different starting values, and selects the best result. The entire process is repeated for a few different values of k, in an attempt to select the best value. K-means is BAD.