Click countries to colour them, or paste a list to shade a map by value - here in this tab, with nothing uploaded.
The lists behind a coloured map - where your customers are, where you have been, where a project runs - are rarely meant for a stranger's server. This map is drawn in your browser from map data that ships with the page.
Change the text in 'A click adds' before clicking - 'Visited', then 'Want to go' - or type the label after each name. Each label gets its own colour and a line in the legend.
Yes: write 'Brazil, 216'. When the second column is numbers the map is shaded light to dark, with a colour bar; numbers either side of zero get two colours meeting at grey.
Common names, official names and ISO codes - 'USA', 'United States', 'America' and 'US' all work, as do 'UK', 'Ivory Coast' and 'Czechia'. Anything it cannot match is listed.
Yes - pick Europe, Africa, Asia, the Americas or Oceania from 'Map', or the United States for states.
Yes, for anything, commercial work included. The map data is public domain (Natural Earth and the US Census Bureau); there is no watermark and no credit required.