ASAP3 is a genetically encoded fluorescent voltage indicator. It was generated by mutagenesis of ASAP2f and contains amino acid replacements L146G, S147T, N149R, S150G, H151D and R414Q compared to ASAP2f (PMID:31835034). For detailed kinetic and spectral properties and a comparison of ASAP3 with other fluorescent voltage indicators, see PMID:31835034.