We present a study on the structural, optical and electrochromic properties of sol-gel films of TiO2 and TiO2-MnO. The XRD analyses show that the incorporation of Mn in the TiO2 host matrix inhibits the crystallization process, as compared to single TiO2 films, which are well crystallized in anatase phase. This conclusion is supported by FTIR analysis. Adding Mn to the TiO2 films leads to a significant narrowing of the optical band gap. The electrochromic characteristics of TiO2-MnO films are better than those of the single titanium dioxide films after annealing at 300 C. © 2020 IOP Publishing Ltd. All rights reserved.