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 Developer Documentation

API Access

Klaviyo provides a versioned REST API for profiles, events, campaigns, flows, segments, and more. Authenticate using a private API key from your account settings.

curl -X GET "https://a.klaviyo.com/api/profiles/" \
  -H "Authorization: Klaviyo-API-Key your-private-key" \
  -H "revision: 2024-10-15"

Key Integration Points

Events API — Track custom behavioral events (page views, purchases, custom actions) to trigger flows and update segments in real time.
Profiles API — Create, update, and merge customer profiles with custom properties for hyper-personalized segmentation.
Campaigns & Flows API — Programmatically create, schedule, and manage email/SMS campaigns and automated flows.
Klaviyo Data Platform (KDP) — Ingest and unify behavioral, transactional, and engagement data at scale (3.7B events/day throughput).

Agentic & AI Integrations

Klaviyo MCP Server — Build agentic workflows using the Model Context Protocol; connect Klaviyo actions to LLM-based agents.
ChatGPT App & Claude Connector — Native integrations for AI-assisted content generation within Klaviyo workflows.

SDKs & Guides

Official SDKs and developer guides are available at developers.klaviyo.com, covering getting started, webhook setup, OAuth for app partners, and the full API reference.

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