Comparea

Comparea (Comparea.org) is an open-source website that displays the size comparison between two countries. It was created in August 2014 by Dan Vanderkam, nicknamed danvk, who is a programmer lived in New York City. 
==Background==
When a user enters the website, it starts with the size comparison between Australia and the United States (Contiguous 48). 
Users have the option to select two countries and compare their respective sizes. The text on the top of the screen displays which one is larger than which another, accompanied by either the percentage of the ratio of sizes of two countries by multiplication of smaller size into larger size.
==Functionality==
Thanks to its TypeScript file source, when a country were selected in a box, the website retrieves data from Wikipedia for any selected countries for size comparison.https://github.com/danvk/comparea/blob/master/server/server.ts
Comparea uses two Albers Equal Area conic projections, centered on the centroids (centers of mass) of the two features. Because the Albers projection is conformal (equal area) and the two projections use the same scale, this results in a valid area comparison.https://www.comparea.org/about
==References==