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 2,994 websites that are Woocommerce Ajax add to cart for variable products Customers. We know of 1,063 live websites using Woocommerce Ajax add to cart for variable products and an additional 1,931 sites that used Woocommerce Ajax add to cart for variable products historically and 282 websites in the United States.
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Get a list of 2,994 websites using Woocommerce Ajax add to cart for variable products which includes location information, hosting data, contact details, 1,063 currently live websites and an additional 929 domains that redirect to sites in this list. 1,931 sites that used this technology previouslyand 282 websites in the United States currently using Woocommerce Ajax add to cart for variable products.
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