Constant Contact vs Customer.io: Side-by-Side Comparison (2025)

Choosing between Constant Contact and Customer.io comes down to your specific use case. Constant Contact is built for nonprofits and local businesses, while Customer.io targets product and growth teams sending behaviour-triggered messages.

Quick Verdict

Overall winner
Customer.io
Better pricing
Constant Contact
More features
Customer.io
For beginners
Customer.io
E-commerce
Constant Contact

Feature Comparison

Feature Constant Contact Customer.io
๐Ÿ’ฐ Pricing
Free Planโœ—โœ—
Starting Price$12/mo$100/mo
Free Trialโœ—โœ“
โš™๏ธ Features
Email Automationโœ—โœ“
Visual Workflow Builderโœ—โœ“
Landing Pagesโœ—โœ—
Built-in CRMโœ—โœ—
SMS Marketingโœ“โœ“
A/B Testingโœ—โœ—
E-commerce Integrationโœ“โœ—
Transactional Emailโœ—โœ“
Remove Brandingโœ—โœ“
๐Ÿค– AI Features
AI Subject Linesโœ—โœ—
AI Send-Time Optimisationโœ—โœ—
๐Ÿ›Ž Support
Email Supportโœ“โœ“
Live Chatโœ“โœ“
Phone Supportโœ“โœ“
Constant Contact
โ˜…โ˜…โ˜…โ˜…โ˜† 4.0/5
Customer.io
โ˜…โ˜…โ˜…โ˜…โ˜† 4.4/5
Our verdict

Constant Contact is best for nonprofits and local businesses.

Try Constant Contact Free โ†’
Our verdict

Customer.io is best for product and growth teams sending behavior-triggered messages.

Try Customer.io Free โ†’

Which Should You Choose?

Choose Constant Contact ifโ€ฆ

  • You are primarily focused on nonprofits and local businesses
  • You value event management
  • You prefer paid pricing
Try Constant Contact โ†’

Choose Customer.io ifโ€ฆ

  • You are primarily focused on product and growth teams sending behaviour-triggered messages
  • You value behavioural triggers
  • You prefer paid pricing
Try Customer.io โ†’

Frequently Asked Questions

Is Constant Contact better than Customer.io?

It depends on your use case. Constant Contact wins for nonprofits and local businesses, while Customer.io is stronger for product and growth teams sending behaviour-triggered messages.

Which is cheaper, Constant Contact or Customer.io?

Constant Contact starts at a lower price point. Pricing scales with subscriber count so total cost depends on your list size.

Can I switch from Customer.io to Constant Contact?

Yes, switching is possible. Most platforms support CSV import/export. Plan time to recreate automations and templates.