Electrochromic coatings are used in a wide range of technical fields. This paper refers to the properties of amorphous Indium-tin-oxide (ITO) and WO3 thin films obtained by dc-magnetron reactive sputtering in different oxygen partial pressures (P-O2) at room temperature (RT). SEM, XRD and UV-Vis-NIR spectroscopy characterized the films prepared in terms of morphology, structure, and optical and electrical properties. The maximum of the optical transmittance in the visible range for the ITO and WO3 films was above 97% and 98%, respectively. These films were incorporated into ECDs (electrochromic devices) whose performance was assessed by optical methods.