We designed CalcUS as a web platform that entire research groups can use. The end-users each possess individual accounts and can form groups. They can view each other's calculations in a group, which promotes collaboration and mutual assistance. This offers an attractive alternative to manual file transfers and instead allows users to browse through the information freely. Due to the easy installation, anyone could also install a local platform instance on their personal computer instead. Indeed, the software infrastructure that manages calculations in CalcUS requires little computing power and memory. Even a small single-board computer (SBC), such as a Raspberry Pi, can be sufficient to host the server. Consequently, research groups that do not want to invest in a powerful workstation can nevertheless run a centralized instance of CalcUS on nearly any functioning computer. In contrast, using a powerful workstation, with the required QM software installation, provides access to practical local QM calculations.