Klaviyo: Email Marketing & SMS

Finally, a real email marketing tool. This is so well integrated with Shopify you can make such powerful decisions about what to send, to who and when - all based on a wealth of customer data sourced from Shopify. Once you start using Klaviyo, the data collection begins for real and you can marry user behavior in email with the shopify data.

Hands down, the best email marketing tool in shopify.