Blind Data is a tool for exploring data availability in the World Bank's WDI and GDF datasets. For any topic, subtopic, or individual indicator, the site shows where and for what time periods data is available. Coverage includes nearly the entire WDI and GDF: more than 4.5 million datapoints from 1157 indicators over 50 years, and all 123 indicators identified by the Bank as being relevant to the MDGs. Users can view data availability for the world as a whole, select specific countries and time periods to view, and compare availability between countries. Individual series' pages link to descriptions and raw data from data.worldbank.org. Blind Data provides quick, quantiative information about where the WDI and GDF are most complete, and where data is lacking. It also enables interesting comparisons of data availability between countries and regions.