Leveraging FST-PSO, an efficient PSO variant that frees users from parametrizing the optimization algorithm, here we designed Swarm-CG, a software that automatizes the parametrization and optimization of bonded parameters in CG molecular models within CG frameworks such as MARTINI. We took particular care to provide a versatile software capable of systematically producing reliable results for virtually any CG model, from simple to complex molecular architectures, using default Swarm-CG settings.