Slimbox is a 4 KB visual clone of the popular Lightbox 2 script by Lokesh Dhakar, written using the jQuery javascript library (in version 2) or the MooTools javascript framework (in version 1). It was designed to be very small, efficient, standards-friendly, fully customizable, more convenient and 100% compatible with the original Lightbox 2.

Although the design and base functionalities are the same as Lightbox, the code was written from scratch and is constantly improved.