# Customer.io

> Event-driven lifecycle messaging for product-led teams.

Customer.io is a marketing automation platform built around events. It ingests any behavioral data you send and lets you build journeys triggered by in-product actions, which makes it a favorite for SaaS, fintech, and product-led growth.

## Pros

- Unmatched flexibility for behavioral, event-based flows
- Strong API and developer experience
- Great for complex onboarding and activation logic

## Cons

- No native Shopify integration
- Steeper learning curve than ecommerce-first tools
- Higher entry price than SMB ESPs

**Canonical:** https://emailcanary.co/tools/customerio

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