Klaviyo
Free tierThe autonomous B2C CRM for AI-powered email, SMS, and omnichannel marketing
Key strengths
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Klaviyo — Technical Overview
Klaviyo is an autonomous B2C CRM built on a real-time customer data platform (CDP) that ingests and processes 2.5 billion events per day across 9 billion customer profiles, with a guaranteed 99.95% uptime SLA. The platform exposes a public API, enabling developers to programmatically manage profiles, events, campaigns, flows, and segments. Native integrations with Shopify, ChatGPT, and Claude are available out of the box, alongside 350+ pre-built integrations covering ecommerce, payments, loyalty, and data warehousing.
The core architecture supports omnichannel delivery across email, SMS, RCS, WhatsApp, mobile push, and social from a single unified data layer. AI agents — Composer (for autonomous marketing content and campaign orchestration) and Customer Agent (for autonomous customer service interactions) — are embedded directly into the platform. Security posture includes SOC 2 Type II certification and GDPR compliance. Pricing is freemium: a free tier covers core features, with paid plans scaling by contact volume and channel usage (email and SMS); enterprise pricing is available for large-scale deployments.