Customer.io

The platform is a customer engagement and marketing automation system that unifies customer data, messaging, and AI to create personalized, automated communications across email, SMS, push, in-app, and other channels. It is for marketers, product and data teams, and developers at B2B companies that need to manage lifecycle messaging. It is delivered as a SaaS platform with APIs, webhooks, and integrations that connects data sources and supports AI agents via MCP, CLI, and API.

Key features

• Visual workflow builder for journeys
• Multi-channel automations
• Transactional messages
• Automation triggers
• Broadcasts scheduling
• A/B testing
• Time delays and branches
• Mobile SDKs
• Subscription center
• Localization for multi-language
• Conversion goals tracking
• Analytics dashboards
• Data exports
• Integrations with sources and destinations
• API and webhooks
• Data warehouse sync
• Reverse ETL
• AI-assisted segmentation
• Ad audience sync
• Custom objects and events
• Identity resolution
• People profiles
• Nested JSON data storage
• Connected forms
• Code and drag-and-drop email editors
• AMP for email