An updated version of the UN CountryStats app is available for iOS. It’s free to download and use.
From United Nations Statistics:
UN CountryStats, a data visualization app based on the World Statistics Pocketbook, is now available to download for free. The revised app, based on the 2014 edition of the Pocketbook, compares key economic, social, environmental and trade indicators for 217 countries and areas. Updated data now covers the years 2005 to 2014. Indicators can be viewed as complete country profiles or visualized as bar graphs in country comparisons. Additional tools include the ability to save graphs as favourites and detailed definitions and sources for each indicator.
The full text of the World Statistics Pocketbook: 2014 ed. is also available online. It’s a free download and also embedded below. It runs 255 pages; PDF.