A free content plugin that enables basic image comparison slider using a simple shortcode.
This is an implementation of the image-compare-viewer library (licensed under MIT) wrapped in a Joomla content plugin.
Syntax is like this:
{imgcomparer} place two images between the tags {/imgcomparer}
You can use the title attribute to give images captions automatically. If you add the word "vertical" to the opening tag, it will show a vertical comparison instead of horizontal.
Full documentation at Kevin's Guides
That is all.