The most important feature of a magnifier is accessibility and that’s an area where One Loupe unfortunately fails. It can only be executed by clicking on the program icon. The only other way that I could think of to make it more accessible was to create a shortcut to the program and assign a keyboard shortcut to it.

It’s not that of a problem though. Once executed a rectangle will be shown that can be moved with the mouse. The mouse-wheel increases or decreases the zoom range and the arrow keys change the size of it.

One additional feature is the ability to copy the part of the screen that is shown in the magnifier to the clipboard. That’s an excellent way to create screenshots for articles like this one.