Nomacs is a simple to use image lounge featuring semi-transparent widgets that display additional information such as metadata, thumbnails and histograms. It is able to browse images compressed archives and add notes to images.

Nomacs includes image manipulation methods for adjusting brightness, contrast, saturation, hue, gamma, and exposure. It has a pseudo color function which allows creating false color images. A unique feature of Nomacs is the synchronization of multiple instances.