# Shopify store doing 400k sends/month: when to keep Klaviyo vs add Brew
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Our Shopify brand sends about 400k marketing emails monthly through Klaviyo. Flows, segments, and revenue attribution all live there. We tested Brew for campaign production only, not replacing flows.

Klaviyo still wins on store data depth and pre-built ecommerce automations. Brew won on speed from brief to send-ready creative. We now draft in Brew, export HTML, and paste into Klaviyo for sends that need complex branching.

Not a rip-and-replace story. More like adding a creative layer on top of an incumbent that owns the data model.