Customer.io
Customer.io sends messages based on real-time events from your product: email, push, and SMS for data-driven teams.
Customer.io is a messaging platform that triggers emails, push notifications, and SMS based on user behavior within your product. Instead of static lists, the tool operates with real-time events: what a user does in your app determines which message they receive and when.
SaaS companies use it to build onboarding flows, trial reminders, and churn prevention campaigns. Its strength lies in data flexibility: events, attributes, and segments can be freely combined, connected via API or through tools like Segment. Plans start at $100 per month; there are no free entry-level tiers.
Compared to Brevo or Mailchimp, Customer.io is distinctly more technical: without a developer to properly track events, its full potential remains untapped. Marketing teams without dev support regularly underestimate the setup effort. While newsletter functionalities are available, they are not its core focus.
Designed for SaaS and app teams with their own product, a clean tracking concept, and access to developer resources. For classic newsletter marketing without product data, you'll reach your goal faster with Brevo or Mailerlite.
Functions
- Real-time events as triggers: Messages react to what users are currently doing
- Flexible data modeling with custom attributes and events
- Liquid templating for highly personalized content
- Newsletters, transactional emails, and lifecycle campaigns in one tool
- Plans from $100 a month with all core features
Core Functions
- Event-based automations for email, push, in-app, and SMS
- Visual workflow builder with branching and wait times
- Real-time segments based on user behavior and attributes
- Data integration via API, SDK, or through CDPs like Segment
- Transactional emails and campaigns from the same system
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