Replica is a next-generation urban planning tool that can help cities answer key transportation and land use questions. Replica offers public agencies, land developers, and the community at large a complete sense of city movement patterns. The result is a higher confidence in critical transportation and land use decisions. Replica has three distinct advantages: Fresher data We create a new Replica every three months allowing comparisons of trip patterns over time and showing how people respond to new infrastructure and policies on the ground. A more detailed picture We replicate trip data for every street and transit route, every neighborhood and census tract, every moment of the day. Greater precision We calibrate our models against ground-truth data from public agencies to ensure accuracy and precision.