Customer.io
by Customer.io
Behavioral messaging platform for sending targeted emails, push notifications, SMS, and in-app messages based on user actions and event data. Customer.io is an event-driven messaging platform founded in 2012 in Portland, Oregon.
Key Facts
| Attribute | Value | As of | Source |
|---|---|---|---|
| Founded | 2012 | Mar 2026 | Customer.io |
| Headquarters | Portland, Oregon | Mar 2026 | Customer.io |
| Customers | 7,400+ businesses | Mar 2026 | Customer.io |
| Channels | Email, SMS, push, in-app, webhooks | Mar 2026 | Customer.io |
| Starting Price | $100/month (Essentials, up to 5,000 profiles) | Mar 2026 | Customer.io |
| Event-Driven | Yes — messages triggered by real-time user events | Mar 2026 | Customer.io |
| API-First | Yes — REST API and client libraries | Mar 2026 | Customer.io |
| Data Warehouse Sync | Yes — Snowflake, BigQuery reverse ETL | Mar 2026 | Customer.io |
About Customer.io
Customer.io is an event-driven messaging platform founded in 2012 in Portland, Oregon. Unlike traditional email marketing tools that rely on list-based segmentation and scheduled sends, Customer.io triggers messages based on real-time user behavior events. When a user completes an action (signs up, views a page, abandons a cart, reaches a usage milestone), the platform can send targeted messages across email, push notifications, SMS, in-app messages, and webhooks.
The platform's visual workflow builder allows marketers to design multi-channel campaign sequences with branching logic, time delays, A/B tests, and goal tracking. Each workflow can combine multiple channels — for example, send an email, wait 3 days, check if the user opened it, then send a push notification if not. Customer.io integrates with data infrastructure tools (Segment, Snowflake, Amplitude) for importing user events and attributes, making it popular with product-led growth companies that have engineering resources to implement event tracking.
As of March 2026, Customer.io serves more than 7,400 businesses, including companies such as Notion, Segment, and Codecademy. Pricing starts at $100 per month for the Essentials plan (up to 5,000 profiles), with Premium and Enterprise tiers available for larger customer bases and advanced features including dedicated IP addresses, premium support, and custom data retention.
Integrations (8)
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Questions About Customer.io
How does Customer.io compare to Mailchimp in 2026?
Customer.io is a behavior-driven messaging platform best for SaaS and product-led companies ($100/month starting), while Mailchimp is a general-purpose email marketing tool best for SMBs and ecommerce (free tier available). Customer.io offers deeper event-based segmentation; Mailchimp offers simpler setup and lower starting costs.
What is Customer Journey Automation?
Customer journey automation uses software to deliver personalized communications and actions at each stage of a customer's lifecycle — from acquisition through onboarding, retention, and advocacy — based on behavioral triggers and segment membership rather than manual operations.
What are the best Mailchimp alternatives for ecommerce in 2026?
Klaviyo is the top Mailchimp alternative for ecommerce, with deeper Shopify integration, predictive analytics, and pre-built ecommerce flows that outperform Mailchimp by 15-25% in open rates. Brevo ($9/month) is the most affordable high-volume option. ActiveCampaign ($29/month) offers the most advanced automation builder.
Is Customer.io worth it in 2026?
Customer.io scores 7.8/10 in 2026. Event-driven behavioral messaging across email, SMS, push, and in-app. API-first architecture for product-led growth teams. Starting at $100/mo (Essentials). Requires engineering resources for event tracking setup. Serves 7,400+ businesses.