Retention.com

Klaviyo

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.

With Mailchimp you can send newsletters and automated emails. You can build your email list with form or import your known contacts. Mailchimp offers pre-designed email templates and a drag and drop email builder.

Postscript

Trusted by over 7,000 Shopify and Shopify Plus stores like Brooklinen, Kopari, and Ugly Water. Postscript gives ecommerce brands the tools they need to run a world-class SMS marketing program. Within minutes you can sync data, start collecting compliant subscribers, have 2-way conversations, and enable deeply targeted campaigns.

Text based marketing for eCommerce stores. Attentive is used mainly as a way to promote offers via SMS, or otherwise used for abandoned carts or to promote retention. Attentive also directly integrates with eCommerce platforms such as Shopify.

Shopify

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. Its ease of use and setup is what's most attractive to merchants, but also the incredibly vast Shopify app store.