Klaviyo: Email Marketing & SMS

Love how deep the integration of Klaviyo with Shopify goes. It makes triggering emails based on customers' shopping behavior more robust and personalized. I rely on Klaviyo heavily to understand our customers as a lot of Shopify data is fed into Klaviyo and it is really easy to use Klaviyo to get analytics. It also helps that Klaviyo has similar deep integration with many other platforms.