Shopify PWA is a progressive web app built on Shopify at the back end and Nacelle, Fabric, Alokai (Formerly Vue Storefront), Shogun, etc. on the front end. There are many ways to build progressive web apps. Shopify PWA is one of the ways that are common among Shopify store merchants. The progressive web app built on Magento is Magento PWA. Similarly, if the backend is BigCommerce, the PWA is called BigCommerce PWA.