Customer.io
Behavioral messaging platform for product-led companies to send targeted emails, push, SMS, and in-app based on user actions.
Customer.io is a messaging automation platform designed for product-led companies. It excels at behavioral messaging — triggering emails, push notifications, SMS, and in-app messages based on what users do in your product.
Key Features
Event-driven messaging triggers. Multi-channel campaigns (email, push, SMS, in-app, webhooks). Visual workflow builder. Liquid templating for personalization. Segment-based targeting. A/B testing for messages. Data warehouse sync.
Best For
Product-led companies with significant event data. SaaS businesses wanting behavioral lifecycle messaging. Teams that need technical flexibility (Liquid, webhooks). Companies outgrowing simpler email tools.
Limitations
Less user-friendly than Mailchimp or Klaviyo. Requires technical setup for events. Less e-commerce-specific than Klaviyo. Can be expensive at scale.
| Plan | Price | Details |
|---|---|---|
| Essentials | $100/mo | Up to 5,000 profiles |
| Premium | $1,000/mo | Starting; advanced features |
| Enterprise | Custom | Dedicated support, SLAs |
Used by
Notion · Segment · Asana · Loom · Retool · LaunchDarkly · Modern Treasury · Observable
Use cases
- Triggering onboarding emails based on product actions
- Re-engaging users who haven't completed activation
- Sending transactional messages with marketing context
- Building multi-channel lifecycle campaigns
Alternatives
- Braze — Enterprise customer engagement platform for orchestrating personalized messaging across email, push, in-app, SMS, and more. ($50,000/year)
- Iterable — Growth marketing platform for creating cross-channel campaigns with workflow automation, AI optimization, and audience segmentation. ($30,000/year)