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 2,996 websites that are Woocommerce Ajax add to cart for variable products Customers. We know of 1,034 live websites using Woocommerce Ajax add to cart for variable products and an additional 1,962 sites that used Woocommerce Ajax add to cart for variable products historically and 271 websites in the United States.
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Get a list of 2,996 websites using Woocommerce Ajax add to cart for variable products which includes location information, hosting data, contact details, 1,034 currently live websites and an additional 919 domains that redirect to sites in this list. 1,962 sites that used this technology previouslyand 271 websites in the United States currently using Woocommerce Ajax add to cart for variable products.
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