This Responsive WordPress slider plugin will allow you to drag two images left and right that is before and after.
https://wordpress.org/plugins/before-after-image-slider/
Widgets · WordPress Plugins
Get access to data on 1,720 websites that are Before After Image Slider WP Customers. We know of 741 live websites using Before After Image Slider WP and an additional 979 sites that used Before After Image Slider WP historically and 283 websites in the United States.
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Get a list of 1,720 websites using Before After Image Slider WP which includes location information, hosting data, contact details, 741 currently live websites and an additional 712 domains that redirect to sites in this list. 979 sites that used this technology previouslyand 283 websites in the United States currently using Before After Image Slider WP.
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