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Customer.io

AI-Powered Customer Engagement Platform·customer.io

Customer.io is a customer engagement platform for creating personalized journeys across email, SMS, push, in-app, WhatsApp, and webhooks. It is built on real-time behavioral and first-party customer data, with a visual workflow builder, an AI Agent, LLM Actions, and native data warehouse integrations. The platform serves product-led growth, marketing, lifecycle, and engineering teams that need event-driven customer messaging at scale.

What it's for

Activation: guide new users toward meaningful actions using behavioral triggersRetention: respond proactively to engagement signals and churn riskCross-sell & upsell: personalize campaigns based on product usageOnboarding: create welcome flows for new users

Features 20

A/B and multivariate testing
Ad audience sync to Meta Ads and Google Ads
AI Agent for building and analyzing campaigns via conversation
Anonymous messaging before sign-up
Conversion goal tracking and dashboards
Custom objects and object types
Custom SMTP
Data Pipelines (customer data platform) with reverse ETL
Data warehouse integrations (Snowflake, BigQuery)
Data-driven audience segmentation
Design Studio with drag-and-drop and code editors
Identity resolution and profile merging
LLM Actions for AI-powered decisioning at send time
MCP Server for connecting AI tools like Claude and Cursor
Mobile SDKs
Multi-channel messaging: email, SMS, push, in-app, WhatsApp, webhooks
Role-based permissions
SSO and two-factor authentication
Transactional messaging
Visual drag-and-drop workflow builder

At a glance

free trialAPI

TypeWeb app

DeploymentCloud

PlatformsWeb

Forproduct-led growth teams, marketing teams, lifecycle marketing teams, engineering teams

CompanyPeaberry Software, Inc. · 2012

Integrations

Meta AdsGoogle AdsSnowflakeBigQueryClaudeCursorChatGPTSlack

Complianceself-reported

GDPRCCPAISO 27001SOC 2HIPAA

Resources

Docs

Pricing

Enterprise pricing is quote-based and requires contacting sales. The Premium plan's $1,000 figure is billed yearly (monthly-equivalent rate). The AI Agent is included free on all paid plans; only LLM Actions consume AI credits, with 100,000 free credits included per paid account.

Essentials$100/mo

Billed monthly; additional profiles cost $0.009 each and additional 1,000 emails cost $0.12

5,000 profiles (people + objects) included; 1 million emails per month; 2 object types

Premium$1000/mo · billed annually

Billed yearly; price shown is the monthly rate under annual billing; HIPAA Compliance is an additional cost

Custom profile and email volume; 10 object types; elevated AI Agent limits

EnterpriseQuote

Custom quote-based pricing; contact sales

Custom profile & email volume; dedicated infrastructure

Early-stage companies that have raised under $10M can get 12 months of Customer.io free through the Startup Program.