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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 1857 reference ratings
4.8/5.0 (1857)
  • Winter 2026 Top Performer Transactional Email Software
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69Testimonials

  • "Performance analytics are very important to us as an eComm business, and Customer.io provides both broad and granular views of message performance. Plus it integrates perfectly with the rest of …

    Bjørn Seaton Chief Marketing Officer

  • “Other email platforms are pretty limited from a behavioral perspective, but it’s clear that Customer.io was built with behavioral messaging in mind from the start.”

    Sean Pfitzenmaier Co-Founder

  • "When we think about the product, you have to think about a multi-generational family, multi-age, multi-need, multi-desire for communications. Frequency of communications varies by demographic and also, again, age."

    Omar Alvarez Founder
68 more testimonials currently locked

34 Case Studies

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    Wendy Zhang Senior Program Manager

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  • How DoSomething increased their open rate by 180%

    Anthony Aurrichio Senior Manager, Digital Engagement
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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 2,062,295+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.