Fluorescent enzyme substrates are highly specific probes for detecting and monitoring enzymatic activity in complex biological samples. This portfolio includes fluorogenic substrates for proteases, phosphatases, kinases, glycosidases, and lipases that generate fluorescent signals upon enzymatic cleavage or modification. Many feature quenched fluorescence or FRET pairs that activate upon enzyme interaction, enabling real-time kinetic measurements. These substrates are crucial for characterizing enzyme kinetics, inhibitor screening, profiling disease-associated enzymatic activity, and developing diagnostic assays for clinical and research applications, offering high sensitivity and compatibility with live-cell formats.