Efficient monitoring of microalgal growth is vital for biomass industrialization and management of water resources. The precise determination of growth phases of biotechnologically relevant species of microalgae is necessary as it allows controlling the onset of target metabolites production such as exopolysaccharides (EPS). However, a low-cost, real-time and ultrasensitive measurement method for direct determination of real-time microalgal growth and EPS production does not exist. Here, we show that Electrochemical Impedance Spectroscopy (EIS) in combination with porous polyurethane(PU)/poly (3,4- ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) electrodes can be used as a real-time probe to monitor microalgal growth and EPS production. We employ Lobochlamys segnis as a microalgae model system and show that growth can be continuously monitored with EIS for 14 days. A logistic growth rate from impedance data of k