Monitorian

It is not uncommon to have to adjust your monitor’s brightness multiple times throughout the day, and this can get very difficult if you are using two or more displays.
Monitorian is a very useful application that enables you to control the brightness of every connected monitor from a simple UI in the system tray area. It integrates perfectly with the OS, and it is exceedingly simple to use.

Looks as though it was introduced in the latest Windows update

Once installed, the application looks right at home on your desktop. It features a minimalistic design that goes great with the Windows 10 interface, so much so that you could swear it was a part of the OS to begin with.
Monitorian is only displayed in the system tray, and a single mouse click is all it takes to bring up the configuration panel. Two button sizes are available, so you can even customize its looks based on your preferences.

Take control of all your monitors with this handy utility

While this application can be useful even if you only have one display, it really comes into its own if you are sporting a multiple monitor setup. Up to four are supported at present, and it should be noted that they must be DDC/CI-enabled.
If you prefer to link the brightness of two or more devices, you can pair them up so that any adjustments will be made to all of them, minus the monitors that haven’t been selected.
The brightness change is gradual, not instant – it takes one or two seconds for the application to make the adjustment, depending on its magnitude, which I believe is a good approach.

Great application for those who use multiple displays

To put it simply, there is no reason not to get this utility if you are using more than one monitor, although those with single displays can still benefit from it. Monitorian offers the simplest possible way of adjusting brightness, and it looks like it’s an integral part of the OS.