feh is described as 'X11 image viewer aimed mostly at console users. Unlike most other viewers, it does not have a fancy GUI, but simply displays images. It is controlled via commandline arguments and configurable key/mouse actions' and is a Image Viewer in the photos & graphics category. There are more than 50 alternatives to feh for a variety of platforms, including Windows, Linux, Mac, Xfce and Flathub apps. The best feh alternative is IrfanView. It's not free, so if you're looking for a free alternative, you could try IrfanView or XnView MP. Other great apps like feh are XnView Classic, JPEGView, Preview and Eye of GNOME.
Lack of configurable hotkeys which are the main appeal to use feh