Customer data and email/SMS platform for e-commerce. The category-leading replacement for Mailchimp in DTC.
From Wikipedia
Klaviyo is an international SaaS technology company headquartered in Boston, Massachusetts, that provides an omnichannel, customer relationship management (CRM) platform with agentic AI features. The platform is used by B2C brands for email marketing, SMS marketing, WhatsApp business management, mobile push notifications, and social media marketing, as well as customer service automation and data management.