We present Katharsis, a tool for "computational drametrics" that implements Solomon Marcus' (1973) theory of mathematical drama analysis. The tool computes and visualizes character configurations and speech statistics for different levels of analysis and allows users to compare different collections of plays. We illustrate the usefulness of the tool for literary studies via several use cases. The tool is freely available online for a test corpus of approximately 100 German plays: http://lauchblatt.github.io/Katharsis/index.html