VCell and COPASI were presented at HARMONY 2024 (https://co.mbine.org/author/harmony-2024/) at University College London. Michael Blinov gave a tutorial on VCell, while Frank Bergman (one of COPASI developers) talked about the web version of COPASI running through JavaScript. Other topics discussed include interoperability of multiple standards like SBML, SED-ML and COMBINE archive supported by both VCell and COPASI.