OneLoupe is described as 'customizable screen magnification tool. It runs in the system tray and can be activated by clicking on the icon or setting a HotKey' and is a Screen Magnifier in the OS & Utilities category. There are more than 10 alternatives to OneLoupe for a variety of platforms, including Windows, Mac, PortableApps.com, Linux and Android. The best alternative is ZoomIt, which is free. Other great apps like OneLoupe are Glassbrick (Free), Magnifixer (Free), Virtual Magnifying Glass (Free, Open Source) and Lens (Magnifier) (Free).
Glassbrick is a screen magnifier that makes zooming your screen quick and easy. It allows you to change the colours of your screen to enhance readability. It’s also customisable, lightweight, fast and efficient.
Magnifixer is a screen magnifier utility. You can place it anywhere on your screen, make it any size you want and select a zoom level. Magnifixer will always show the area of your screen where the mouse cursor resides.
Kokodeka is a magnifier software. Magnifier window also appears in the mouse position while zooming in near the mouse position. In other words, the vicinity of the mouse is always enlarged, and the enlarged part moves with the mouse movement.