SimCCS, supported by the U.S. DOE’s Office of Fossil Energy and Carbon Management, is a powerful optimization tool for designing integrated CCS infrastructure networks. Developed over a decade and now in its third iteration, SimCCS3.0 introduces new capabilities, including multi-scale, temporal, and environmental justice modeling. Using user-provided data on CO2 sources, sinks, and transportation routes, SimCCS formulates an optimization problem to determine the most cost-effective network design. Solutions can be run through a high-performance computing interface or locally with third-party software. Built in Java and freely available, SimCCS encourages collaboration across the CCS community to drive infrastructure advancements.