Klaviyo

Free tier

The autonomous B2C CRM for AI-powered email, SMS, and omnichannel marketing

Free tier available·All audiences·API available

Key strengths

Unified B2C CRM combining marketing, service, and analytics in one platformAI agents (Marketing Agent & Customer Agent) that autonomously create campaigns and resolve support queriesReal-time customer data platform processing 3.7B+ events daily across 8B profiles350+ pre-built integrations covering ecommerce, POS, loyalty, and shippingOmnichannel reach across Email, SMS, WhatsApp, RCS, Mobile Push, and Social

Free tier + paid plans

Boston, United States

Founded 2012

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Klaviyo is architected as both a system of record and a system of action, combining a real-time Customer Data Platform (Klaviyo Data Platform / KDP), an AI inference layer, and a multi-channel campaign execution engine in one stack. It processes an average of 3.7 billion events and 1.6 billion API calls daily, maintaining unified profiles across 8 billion customers.

The platform exposes a robust REST API suite and supports agentic workflows via a Klaviyo MCP Server, enabling developers to build custom AI-driven automations. Native integrations are available for Shopify and 350+ other platforms, with connectors for ChatGPT, Claude, and other LLM toolchains. The Klaviyo Data Platform provides real-time behavioral, transactional, and engagement data that can be segmented and acted upon programmatically across all channels.

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