OpenFactBook is a community-maintained, free and open-source resource for exploring comprehensive information about countries and territories. Described as a successor to the CIA World Factbook, it brings together data on 254 countries and territories across topics including geography, demographics, government and economics. The site also draws on information from the World Bank and REST Countries, with its data identified as public domain under U.S. law.

Visitors can browse countries by region, explore rankings such as population and GDP, and compare nations side by side using measures including population, economic output and area. Search tools help users find countries, regions or specific data, while organized country and field comparisons make it easier to examine information across locations. OpenFactBook presents its content without advertisements or a paywall and invites users to support the project through donations. Its stated aim is to make detailed country data freely accessible to everyone, supported by a community-focused approach rather than advertising or investors.