Klaviyo is the most deeply integrated email and SMS platform for e-commerce. Native Shopify, WooCommerce, BigCommerce, and Magento sync brings purchase history, browse data, and product catalogues into segmentation and automation.
All paid plans include the same advanced automation features (flows, predictive analytics, AI segments), so the only thing that scales with contact count is price. The free plan covers 250 active profiles, and Klaviyo only counts active profiles rather than all contacts, so suppressed and unengaged contacts do not push you into a higher tier.
Klaviyo was founded in 2012 and is headquartered in Boston, USA.