Lay a colored overlay over the entirety of the screen on a personal computer and control the contrast, sharpness, and visibility with a set of settings in the program. It also features customizable notifications and is accessed from the Toolbar. Multi-monitor support is possible.
Very similar to Dark Screen, ssOverlay (the ss stands for Scotopic Sensitivity), places a coloured overlay onto the screen. The colour and transparency levels can be adjusted to suit the user. Everything is controlled from the icon in the Notification area of the Taskbar (where the clock sits). Clicking this icon will open the menu which allows the selection of Multi Monitor Support, and the percentage of dimming of the screen