Mito-DK is a small-molecule fluorescent dye with the capability of crosstalk-free response to polarity and mtDNA as well as mitochondrial morphology. Mito-DK has high photostability, low cytotoxicity, and good mitochondria-targeting properties. Mito-DK can be used for real-time tracking and multidimensional assessing of mitochondria-related pyroptosis in cancer cells^[1].