Customer.io — Email Marketing

What is Customer.io?

Customer.io is a customer engagement platform that lets you trigger personalized messages (email, push, SMS, webhooks) based on what users actually do in your app—like signing up, abandoning a cart, or reaching a milestone. It connects to your product data via API or SDK and uses a visual workflow builder to automate campaigns without coding.

Who is it for?

Customer.io is built for product teams and growth marketers who need behavioral lifecycle campaigns (onboarding, re-engagement, upsell) without developer dependency. Companies with complex user journeys needing conditional logic and multi-channel messaging will benefit most. It may be overkill for simple newsletter-only broadcasts or very small lists under 500 profiles.

Real use cases

Common use cases include: sending a welcome email sequence right after a user signs up; triggering a push notification when a trial user hits a key feature milestone; or sending a personalized SMS offer when someone abandons a cart. The AI Agent (beta) can build and optimize campaigns from a simple prompt, making execution faster.

Key strengths

Customer.io offers real-time event processing (messages fire within seconds), a drag-and-drop workflow builder with branching logic, and multi-channel support (email, push, SMS, webhooks) in one place. It also includes a built-in AI Agent, A/B testing, and advanced segmentation using events, custom attributes, or SQL.

• Behavioral triggers — Send messages based on any user action or attribute change
• Visual workflow builder — Drag-and-drop conditional paths without coding
• Segmentation engine — Filter users by events, properties, or custom SQL
• A/B testing — Test subject lines, content, timing, and sender names
• Multi-channel — Email, push notifications, SMS, and webhooks from one interface
• Real-time analytics — See open rates, click rates, and conversion per workflow
• AI Agent (beta) — Build campaigns and analyze performance via natural language prompts

Customer.io pricing: from $100/mo. Billing model: Freemium.

Essentials — starts at $100/month (billed monthly)

For teams getting started with data-driven messaging. Includes 5,000 profiles (people + objects), 1 million emails per month, 2 object types, AI Agent with core execution skills, visual workflow builder, LLM actions (100K credit sample), email and community support, and basic data integrations.

Premium — starts at $1,000/month (billed yearly)

For teams scaling across channels with custom workflows. Everything in Essentials, plus custom profile and email volume, 10 object types, elevated AI Agent limits + custom skills, daily routines (scheduled tasks), premium chat & email support, 90-day onboarding support, HIPAA Compliance, and premium data integrations.

Enterprise — custom pricing

For organizations that need dedicated infrastructure and support. Everything in Premium, plus best pricing on volume, custom Agent limits and execution skills, priority technical support, migration support, dedicated Customer Success Manager, dedicated hardware, audit logging & data governance, dedicated Technical Implementation Specialist, and shared Slack channel.

14-day free trial — No credit card required. Cancel anytime. Startup Program — Companies raised under $10M qualify for 12 months free.

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