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Klaviyo is the ecommerce marketing platform UK online brands use to drive revenue from email and SMS. It's built around customer data — purchase history, browsing behaviour, and product affinity — powering hyper-personalised flows like abandoned-cart and post-purchase sequences. Pricing starts free up to 250 contacts, then scales with contacts and sends. It integrates natively with Shopify, WooCommerce, and Stripe. GDPR compliant with UK data processing terms. For UK DTC brands, Klaviyo is the default choice; its reporting ties revenue directly to campaigns.