cotat is a visualization tool for the analysis of contact tracing data. Given a dataframe of people (along with their attributes) and a dataframe of known contacts among the individuals, cotat exports an interactive HTML visualization of the network. Furthermore, certain columns of the people dataframe can be labeled as “membership columns” which allows one to visualize which people belong to the same groups (e.g. building, club, etc..) even if a contact between those individuals has not been reported.