Not strictly a quantitative data analytics tool, but a fascinating interactive report by an Indian data visualization company Gramener . It is set up to provide visual insights into color distribution and dominance on the flags of 196 countries around the world. This visualization tool displays a map which is colored based on dominant colors of the countries.

You have an option to change from the map to a flag view which is a list of countries with corresponding percentages of color prevalence on respective flags.  Gramener developers also included a set of filters which offer the ability to highlight different continents, countries by a specific dominant color, flag symbols, shapes etc.

On the top of the report a scrollbar allows switching between preset highlights on several groups of country flags. For example, by selecting one of the preset highlight boxes you may learn that the flags of Romania and Chad are identical.