The app is free to download and use. Version 3.0 was released on March 8, 2017.
From the iTunes App Store:
UN CountryStats is a free data visualization app that gives users portable access to social, economic and environmental data from 229 countries and areas. With a simple and easy to use interface, this app enables users to compare various indicators across multiple countries and years.
Direct to Learn More and Download
See Also: Android Version (via Google Play)
Note: Last updated October 2016