Country statistical capacity is increasingly recognized as crucial for development, but no academic study exists that reviews the available assessment tools. This paper offers the first review study that fills this gap, paying particular attention to data and practical measurement challenges. It compares the World Bank's recently developed Statistical Performance Indicators and Index with other widely used indexes, such as the Open Data Inventory index, the Global Data Barometer index, and other regional and self-assessment tools. The findings show that each index brings advantages in data sources, number of indicators, measurement focus, coverage of countries and time periods, and correlation with common development indexes. The Open Data Inventory index covers the most countries, the Global Data Barometer index collects data through its surveys, and the Statistical Performance Indicators and Index offer a broader framework for assessing statistical systems. The paper offers further thoughts on the potential mechanisms through which these tools can bring positive impacts on economic activities and some political economy concerns, as well as future directions for development.