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 1,727 websites that are Before After Image Slider WP Customers. We know of 721 live websites using Before After Image Slider WP and an additional 1,006 sites that used Before After Image Slider WP historically and 285 websites in the United States.
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Get a list of 1,727 websites using Before After Image Slider WP which includes location information, hosting data, contact details, 721 currently live websites and an additional 745 domains that redirect to sites in this list. 1,006 sites that used this technology previouslyand 285 websites in the United States currently using Before After Image Slider WP.
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