Kartavera is an atlas that draws every country at its true size. The map above uses the Equal Earth projection, where a square kilometre in Greenland takes exactly as much screen as one in Congo. Pick any country, drag it anywhere on the world, and compare it with what it lands on. Slide the map back to Mercator to see how much your usual map has been lying.
Gerardus Mercator drew his map in 1569 so that a ship's compass course would be a straight line. To do that he had to stretch the world more and more toward the poles. Greenland ends up looking like Africa; in reality Africa is fourteen times larger. The projection was never meant for comparing countries, yet it is the one on nearly every screen.
Equal Earth, published in 2018, keeps areas exact and continents recognisable. Kartavera uses it for the world map, and when you drag a country across the map it rotates the whole sphere underneath, so the country's area cannot change, not even by a pixel. The numbers beside the map come from Natural Earth, Wikidata and the World Bank, each with its year and source.