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 1,576 websites Before After Image Slider WP Customers. We know of 1,015 live websites using Before After Image Slider WP and an additional 561 sites that used Before After Image Slider WP historically and 412 websites in the United States.
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Get a list of 1,576 websites using Before After Image Slider WP which includes location information, hosting data, contact details, 1,015 currently live websites and an additional 937 domains that redirect to sites in this list. 561 sites that used this technology previouslyand 412 websites in the United States currently using Before After Image Slider WP.
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