Eddy is a grasshopper plugin to incorporate wind and outdoor comfort analyses into sustainable architectural design. Eddy focuses on annual ventilation analyses by employing both cylindrical and box-shaped simulation domains. Unlike other CFD tools with steep learning curves, Eddy is easy-to-use and features a straightforward user interface based on Grasshopper for Rhinoceros. It helps architects and engineers to design sustainable and energy-efficient cities and empowers them with actionable ventilation and comfort metrics such as pressure coefficients and the UTCI distributions. For more experienced users, Eddy’s user interface can be dynamically extended to unlock the full potential of customized outdoor urban CFD simulations.