Shopify is a commerce platform that allows anyone to set up an online store and sell their products. It's the go-to eCommerce platform for young direct-to-consumer brands. It's ease of use and setup is what's most attractive to merchants, but also the incredibly vast Shopify app store.
Klaviyo is the best in class email marketing solution for eCommerce. It's powerful because it connects to your store, and you can create awesome customer segments based on past purchasing behaviors, customer preferences, and even future predictions of spending.
Pixelpop lets you collect email addresses via popups and sync new email signups straight to your mailing service. Also use the tool to promote special offers, coupon codes and more. Time your popups with exit-intent delays, page delays and target by device, country, page, URL/UTM.