The Black Arcs is a Canadian software firm building simulation and analysis tools for many sectors. Our flagship product, Citisketch, enables users to create compelling digital twins of neighbourhoods and cities that model the population’s pattern of life and how changes to infrastructure or policy are likely to influence behaviour. Citisketch is intuitive and visual, and can be used to test plans, communicate them to others, and display a common operating picture when discussing complex operations. The company is currently collaborating with Canada’s Department of National Defence on next-generation planning and disease modelling tools.