Evident is a web-based software tool with an interactive user interface, implemented in HTML, Web Graphics Library, mod_python and QIIME. The interface of Evident provides: (i) parameter selection (i.e., study of interest, number of sequences per sample, the number of samples to use, and the number of iterations); (ii) selection of the kind of visualizations to generate (Demo PCoA shows the original results from the study, and PCoA recalculates the study using the user-defined parameters in (i); (iii) the WebGL plot display.