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 2,827 websites Woocommerce Ajax add to cart for variable products Customers. We know of 1,391 live websites using Woocommerce Ajax add to cart for variable products and an additional 1,436 sites that used Woocommerce Ajax add to cart for variable products historically and 346 websites in the United States.
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Get a list of 2,827 websites using Woocommerce Ajax add to cart for variable products which includes location information, hosting data, contact details, 1,391 currently live websites and an additional 1,209 domains that redirect to sites in this list. 1,436 sites that used this technology previouslyand 346 websites in the United States currently using Woocommerce Ajax add to cart for variable products.
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