Customer.io is an event-driven lifecycle messaging platform that sends email, push, in-app, SMS, WhatsApp, LINE, and webhooks from one visual workflow builder. It bills on profiles — people plus objects like companies, products, or orders — rather than per seat, with unlimited user seats on every plan and per-unit overages for extra profiles and email volume. Its AI Agent, currently in beta and included on all tiers, has persistent memory, runs core and custom execution skills, and executes scheduled Routines; AI also shows up as LLM actions inside journeys, an AI segment builder, and an AI message translator. An MCP server ships on every plan, and data can be hosted in US or EU data centers.

Straightforward pricing that grows with you

Key features

- AI Agent (beta) — persistent memory, core + custom execution skills, all plans
- Routines — scheduled agent tasks (1 weekly Essentials, 5 daily Premium)
- Visual workflow builder with send-time optimization
- LLM actions as a step inside journeys
- AI-powered segment builder and suggested segments
- Custom objects — model companies, products, orders as profiles
- Design Studio — AI global styles, AI message translator, content analysis
- Email, transactional, push, in-app, SMS, WhatsApp, LINE, webhooks
- Reverse ETL, data index, connected forms, unlimited API calls
- MCP server on every plan
- Anonymous messages (Premium+)

Strengths

- AI Agent and MCP server on the $100 entry tier
- Profile-based billing, unlimited user seats
- SOC Tier II, ISO 27001, GDPR, CCPA, plus HIPAA on Premium+
- US or EU data centers on all plans
- Warehouse-driven segmentation, not list-import-only
- 12 months free for companies that raised under $10M

Best for

Product-led SaaS team triggering messages off in-product events
Technical lifecycle marketer building journeys on custom objects
Startup eligible for the 12-month free program
Team with data in Snowflake or S3 needing warehouse-driven segments
Healthcare-adjacent business needing HIPAA-covered messaging
EU company requiring in-region data residency

Integrations

Segment (native, deep, system)
Salesforce (native, deep, system)
HubSpot (native, deep, system)
Snowflake (native, deep, system)
Google Cloud Storage (native, basic, system)

Pricing

USD 100 / month

Customer.io

Key features

Strengths

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