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 2,990 websites that are Woocommerce Ajax add to cart for variable products Customers. We know of 1,030 live websites using Woocommerce Ajax add to cart for variable products and an additional 1,960 sites that used Woocommerce Ajax add to cart for variable products historically and 265 websites in the United States.
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Get a list of 2,990 websites using Woocommerce Ajax add to cart for variable products which includes location information, hosting data, contact details, 1,030 currently live websites and an additional 932 domains that redirect to sites in this list. 1,960 sites that used this technology previouslyand 265 websites in the United States currently using Woocommerce Ajax add to cart for variable products.
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