"Physiological synchrony," a phenomenon that the physiological signals of individuals synchronize, is attracting attention in psychology, neuroscience, and cognitive science. However, while physiological synchrony in a remote environment is an essential and interesting topic under the growing needs of remote communication, there has been limited research investigating it. To stimulate research in this field, we developed OpenRBSync, an open-source toolkit to acquire and save time-synchronized biosignals in remote environments. We plan to conduct a user study exploring how visualizing synchrony affects communication.