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Customer.io

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Read 69 Customer.io reviews and testimonials from customers, explore 34 case studies and customer success stories, and watch 1 customer videos to see why companies chose Customer.io as their Transactional Email Software

Customer.io is a leading customer engagement platform designed for organizations to create personalized customer journeys that engage, convert, and scale. Orchestrate messages across all channels, including email, in-app, SMS, push, and webhooks. Over 7,500+ companies, including Notion, Typeform, and Angi, rely on Customer.io to power their messaging needs.

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  • 69 Testimonials View
  • 34 Case Studies View
  • 1 Customer Videos View
Customer Rating Review Score based on 1879 reference ratings
4.8/5.0 (1879)
  • Winter 2026 Top Performer Transactional Email Software
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69Testimonials

  • “We’ve long needed the ability to create advanced nurture flows that can send our contacts down more personalized paths."

    Michael Roberts Head of Marketing Automation

  • "Customer.io has proven very useful for this in the past years. The fine-grained control, pleasantly responsive UI and fast support response times not only make Customer.io a powerful tool that …

    Nathan Skwortsow Co-Founder and CTO

  • "Customer.io is really helpful and always quite fast to get back to us when we have any questions."

    Kasper Ernerot Communication Manager
68 more testimonials currently locked

34 Case Studies

  • How Spotahome became 5x more efficient with Customer.io

    Jorge Alonso Marketing Manager

  • Email marketing that deserves adouble tap Inside Buffer’s strategy

    Sophie Gil Audience Development Lead

  • How GNC Mexico uses Raidar.io and Customer.io to drive in-store sales

    Marcelo Martinez Founder & CEO
33 more case studies currently locked

1 Customer Videos

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Additional Customer.io Information & Resources

Read Customer.io Reviews, Testimonials & Customer References from 69 real Customer.io customers.

Browse Customer.io Case Studies, Customer Success Stories, & Customer References from 34 businesses that use Customer.io.

Watch Customer.io Customer Videos to learn why 1 businesses chose Customer.io.

Explore answers to frequently asked questions about Customer.io.

FeaturedCustomers has 2,101,140+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.