Sulfo Cy7-N3 is a Sulfo Cy7-azide compound and functions as a fluorescent dye. It can be employed in cell imaging through click reactions. The molecule contains an azide group, enabling it to engage in a copper-catalyzed azide-alkyne cycloaddition reaction (CuAAc) with molecules that have an alkyne group. Additionally, it can undergo strain-promoted alkyne-azide cycloaddition (SPAAC) with molecules possessing DBCO or BCN groups.