•Bright: Superior dyes for maximum separation between live and dead cells.•Stable: No loss of signal afterfixation and permeabilization.•Flexible: Live-or-DyeTM Fixable Viability Stains can be used for flow cytometry or microscopy and are compatible with antibody staining and other cell staining techniques.•Choice: 8 colors across the spectrum, as well as 1 red nuclear dye, for maximum versatility in multi-color flow cytometry and cell imaging.