Klaviyo is a business-to-consumer CRM and data platform that helps consumer-facing businesses aggregate first-party customer data, generate consumer intelligence, and execute personalized marketing and service interactions across email, SMS, WhatsApp, push notifications, and social channels. The company operates a subscription-based business model, charging customers primarily on the number of active consumer profiles stored and volume of messages sent, with revenue expanding as customers adopt additional channels, features, and use cases including AI-powered marketing automation, customer service solutions, and analytics. Klaviyo serves customers across eCommerce, education, entertainment, hospitality, and other segments—ranging from small entrepreneurs to large enterprises—and grows through a product-led acquisition approach leveraging integrations, partner ecosystems, and word-of-mouth rather than heavy direct sales.