okdzhimiev

Sravnitel is a WordPress plugin by Elphel Inc. based on a jQuery plugin jquery.sravnitel.js.
Features
<ul>
<li>Compare 2+ images </li>
<li>Zoom and pan</li>
<li>Initial zoom and offset</li>
<li>Touch events: click, drag, pinch to zoom</li>
</ul>
Tips
<ul>
<li>Click on the view area to quickly switch between left and right image</li>
<li>Click on the zoom info in the top right to zoom-to-fit the view area</li>
<li>To place several instances of the plugin assign unique ids: [sravnitel id=’test1′ …], [sravnitel id=’test2′ …]</li>
</ul>
Working demo
<a href="http://blog.elphel.com/2017/01/lapped-mdct-based-image-conditioning-with-optical-aberrations-correction-color-conversion-edge-emphasis-and-noise-reduction/" rel="nofollow ugc">Elphel’s Blog: Lapped MDCT-based image conditioning with optical aberrations correction, color conversion, edge emphasis and noise reduction</a>
Quick examples
<ul>
<li>Fit image into the view window, w/o titles: 
[sravnitel images=”ID0,ID1,ID2″ width=640 height=480]</li>
<li>Fit image into the view window, with titles and toggle button: 
[sravnitel images=”ID0,ID1,ID2″ width=640 height=480 showtitles=true showtoggle=true]</li>
<li>Also fit image, with titles: 
[sravnitel images=”ID0,ID1,ID2″ width=640 height=480 showtitles=true zoom=0]</li>
<li>Zoom 30%, with titles, x=0 and y=0 in the center of the view window: 
[sravnitel images=’ID0,ID1,ID2′ width=640 height=480 showtitles=true zoom=0.3 center_x=0 center_y=0]</li>
</ul>
Shortcode Parameters
<ul>
<li>id – int – 0 – wrapper’s <div> element id</li>
<li>images – str – ” – (required) list of images ids (attachment_id), comma separated</li>
<li>width – int – 530 – view window width px</li>
<li>height – int – 300 – view window height px</li>
<li>showtitles – bool – false – show/hide titles</li>
<li>showtoggle – bool – false – show/hide button – switch between left and right image</li>
<li>index_l – int – 0 – init, left image – is the index of the images array, starting from 0</li>
<li>index_r – int – 1 – init, right image – is the index of the images array, starting from 0</li>
<li>zoom – float – 0 – init, zoom, 0 – fit to view window, 1.0 – 100%</li>
<li>center_x – int – 0 – init, x coordinate of the original image to be placed in the center of the view window </li>
<li>center_y – int – 0 – init, y coordinate of the original image to be placed in the center of the view window</li>
</ul>

Sravnitel

Sravnitel is a WordPress plugin by Elphel Inc. based on a jQuery plugin jquery.sravnitel.js.

Aluka

BA Plus – Before & After Image Slider is a plugin for WordPress which allow you compare two or more different images in the same frame.
<a href="http://dev.abydx.com/bai/" title="Live Demo" rel="nofollow ugc">Try out the demo</a> to see it in action!
<h3>Features</h3>
<ul>
<li>Compare two or more images</li>
<li>Slideshow Option</li>
<li>Auto Slide Bar Mode</li>
<li>Option to change slide duration</li>
<li>Fully Responsive</li>
<li>Touch & Swipe on Mobile Devices</li>
<li>Define Any Initial Position for Your Slider</li>
<li>Horizontal or Vertical</li>
<li>Hover or Drag Interaction</li>
<li>Many Styles to Choose</li>
<li>Many Options to Customize (Labels, Captions, Slide Bar,…)</li>
<li>Shortcode Generator</li>
</ul>
<h3>Premium Features</h3>
<ul>
<li>Import/Export Customizer Settings</li>
<li>Export Slider to Static HTML</li>
</ul>
<h3>Premium Support</h3>
We provides very limited support on the WordPress.org forums. Please feel free to post questions or bug reports, but for timely support, we recommend purchasing Pro version. 
<a href="http://dev.abydx.com/bai/pro/" title="Pro version" rel="nofollow ugc">View pro version</a>
<h3>Privacy Policy</h3>
This plugin doesn’t collect/store any user related information.

BA Plus – Before & After Image Slider FREE

This plugin works as advertised, and I will end up getting the premium version as it is reasonably priced.

Excellent

Offers a simple and effective way to compare two or more different images in the same frame.

Sravnitel vs BA Plus – Before & After Image Slider FREE