jGCaMP8s is a genetically encoded fluorescent Ca[2+] indicator that is built upon the GCaMP scaffold. The '8' series of jGCaMP sensors have fast kinetics without compromising sensitivity. For detailed kinetic and spectral properties and a comparison of jGCaMP8s with other jGCaMP '8' series sensors and jGCaMP7f, see PMID:36922596.