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In this research, we investigate the effect of metal doping on the electrochromic (EC) performance of tungsten trioxide (WO₃) films. These films were prepared by a novel method involving solution processing and thermal annealing. In this procedure, ammonium tetrathiotungstate ((NH₄)₂WS₄) was dissolved in dimethylformamide at a high concentration ratio (200 mg mL⁻¹) to obtain a homogeneous solution and then spin-coated onto the indium thin oxide (ITO) substrate for use as a working electrode. Subsequently, the film was annealed at the different temperatures (200, 300, 400, and 500 °C) to form a crystal structure of WO₃. X-ray diffraction, Raman, and X-ray photoelectron spectroscopic results confirm the crystal formation of WO₃. Moreover, in order to improve the electrochromic performance, different concentrations (10, 20, 30, and 40 mM) of different metal chlorides such as PtCl₄, PdCl₂, AuCl₃, AgC_l …