Klaviyo

Klaviyo is a marketing and customer data platform built for business-to-consumer brands, especially in e-commerce, and it has expanded into a broader customer relationship management system aimed at consumer businesses. Its core is a data platform that ingests every customer event from a store, from browsing and cart activity to purchases and support interactions, and makes that available for segmentation, personalization, and reporting. On top of the data, Klaviyo provides email and SMS marketing with prebuilt automated flows for welcome series, abandoned carts, post-purchase, and win-back, plus push notifications, forms, product reviews, and predictive analytics like estimated customer lifetime value and next order date. In 2025 the company added a customer service product and introduced AI agents for marketing and customer support, positioning the combined offering as an AI-first B2C CRM covering marketing, service, and analytics. Klaviyo integrates deeply with Shopify and other commerce platforms and is used by a very large number of online brands. It is publicly traded. Klaviyo offers a free tier for small lists, with paid pricing that scales by the number of contacts and messaging volume, and additional pricing for the service and advanced products.