This plugin activate add to cart through ajax on varible product.
https://wordpress.org/plugins/woocommerce-ajax-add-to-cart-for-variable-products/
Widgets · WordPress Plugins
Get access to data on 2,992 websites that are Woocommerce Ajax add to cart for variable products Customers. We know of 1,022 live websites using Woocommerce Ajax add to cart for variable products and an additional 1,970 sites that used Woocommerce Ajax add to cart for variable products historically and 267 websites in the United States.
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Get a list of 2,992 websites using Woocommerce Ajax add to cart for variable products which includes location information, hosting data, contact details, 1,022 currently live websites and an additional 907 domains that redirect to sites in this list. 1,970 sites that used this technology previouslyand 267 websites in the United States currently using Woocommerce Ajax add to cart for variable products.
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