Jilt App 
Jilt App is used by % of sites
Official Website
https://community.shopify.com/c/shopify-apps/jilt-is-over-what-app-to-use-for-abandoned-carts-now/td-p/1575095Category
Cart abandonmentShopify apps
Jilt App helps ecommerce store owners track and recover abandoned orders. Works seamlessly with Shopify and WooCommerce.