'Appacity' is a free Opacity changer for Windows. Appacity will scan for open Windows and list them. The user then can select the Window and change the Opacity on a 0-100 scale. Appacity is freeware. Appacity is very light with only ~2MB. It also features an Automatic Updater which can be also turned off in the settings. Appacity has an Opacity limit by default, so cant accidentally make Windows completely invisible. This can be turned off as well. Appacity got a new window finder with the last update. Appacity has an automatic refresh system that can be turned off or be slowed down in the settings. In the current version, the Opacity will be reset once you close the process of the window. Opacity changes are instantly visible so the user can better track the opacity.