Klaviyo is a B2C CRM for consumer brands. The platform handles email, SMS, and mobile messaging on top of a built-in customer data platform and marketing analytics. Customers include Glossier, Mattel, and Unilever.

Founded in 2012 by Andrew Bialecki and Ed Hallen. Headquartered in Boston with around 2,000 employees worldwide. Serves 193,000+ paying brands across 80+ countries.

The platform processes 2.5 billion events and 1.6 billion API calls a day across 7.3 billion customer profiles. The name comes from "clavija," a Spanish mountaineering term.

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