Electrochromic devices have received great attention because of the increment in electrochromic smart window markets for building and vehicles. Recently, electrochromic materials not only enhanced electrochromic performances but also provided additional functions (energy storage, light-emitting diodes, and solar cell). Meanwhile, electrochromic devices are being developed with the goal of large-scale applications such as electrochromic smart windows for building and vehicles, there are still significant needs for reliability of materials and simplify their fabricating processes. In this study, double-layer hydroxide films are reported as energy-storable electrochromic materials with ultrafast kinetics in alkaline electrolyte. Core/shell-like cobalt hydroxide/nickel hydroxide nanofilms deposited within short electrodeposition time have capabilities for multiple color changes (yellow-green-brown) and show extremely fast colored/bleached switching time that are comparable to state-of-the-arts. Furthermore, the cobalt hydroxide/nickel hydroxide nanofilms were indicated high capacitance and rate performance as a battery-type supercapacitors, with higher electrochromic kinetics than those with similar level of capacities for energy storage.