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Customer.io vs Klaviyo
Customer.io and Klaviyo are both Marketing Automation & Personalisation tools. Here is how they compare on pricing, free plans, AI integrations and platforms, and when each is the better fit.
Side by side
| Feature | Customer.io | Klaviyo |
|---|---|---|
| Category | Marketing Automation & Personalisation | Marketing Automation & Personalisation |
| Pricing | $100–1,000/mo | Free option available |
| Free option | Not listed | Yes |
| AI integrations | MCP server, Claude, ChatGPT, Codex, Cursor, Other | MCP server, Claude, ChatGPT |
| Best for | — | Ecommerce brands, Enterprise brands, Marketing teams |
| Links | Customer.io listingVisit website (opens in a new tab) | Klaviyo listingVisit website (opens in a new tab) |
Which to choose
Choose Customer.io if
- work across product, marketing, and engineering teams
- need reverse ETL sync with Snowflake or BigQuery
- want in-app messaging and webhooks alongside email, SMS, push, and WhatsApp
- plan to connect developer AI tools like Cursor, Codex, or Claude Code
Choose Klaviyo if
- run an ecommerce or retail brand using platforms like Shopify or WooCommerce
- want a built-in helpdesk and autonomous customer support agent
- need a free option to start before moving to quote-based pricing
- require RCS messaging alongside email, SMS, WhatsApp, and mobile push
Verdict
Customer.io suits product, marketing, and engineering teams that want data control and developer-friendly workflows. It connects directly to data warehouses like Snowflake and BigQuery via reverse ETL, supports webhooks and in-app messaging, and integrates with coding tools like Cursor and Claude Code. However, it has no listed free option, and costs scale with profile volume and message counts from a base of $100 to $1,000 per month.
Klaviyo is built for ecommerce and retail brands that want B2C marketing and customer service in one place. It combines a customer data platform with a helpdesk, an autonomous support agent, and connections to Shopify and WooCommerce. Klaviyo offers a free option, though its broad feature set and AI agents can create a learning curve for smaller teams.
FAQ
- How does pricing compare between Customer.io and Klaviyo?
Customer.io uses flat pricing starting from $100 to $1,000 per month, with usage costs that scale with profile volume and message counts. It does not list a free option. Klaviyo offers a free option and uses quote-based pricing for paid plans.
- Which tool is better for ecommerce brands?
Klaviyo is designed specifically for ecommerce and retail brands, offering native integrations with platforms like Shopify and WooCommerce. Customer.io is built for broader product, marketing, and engineering teams that rely on custom behavioural events and data warehouses.
- How do their messaging channels and customer support features differ?
Both tools support email, SMS, push notifications, and WhatsApp. Customer.io adds in-app messaging and webhooks, while Klaviyo adds RCS messaging, a helpdesk for support ticketing, and an autonomous customer support agent.
- Do both platforms support Model Context Protocol (MCP) and AI integrations?
Yes, both platforms offer an official MCP server alongside integrations for ChatGPT and Claude. Customer.io also provides plugins for developer tools like Cursor and Codex, plus a Grok bot.