DiversityAS (was Diversity) is a tool for entering and inspecting ecological data, and for measuring the diversity of ecological communities. Spreadsheets have long been the standard tool for ecological data entry, but spreadsheets are cumbersome for working with these data. Diversity makes it quick to enter your data and to see the composition of your samples. Standard measures of diversity, including both individual-based and sample-based rarefaction, are made blazingly fast.