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Customer.io

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Read 69 Customer.io reviews and testimonials from customers, explore 29 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
  • 29 Case Studies View
  • 1 Customer Videos View
Customer Rating Review Score based on 1687 reference ratings
4.8/5.0 (1687)
  • Winter 2026 Top Performer Transactional Email Software
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    Drip is the CRM Salesforce didn’t build. The first e-commerce CRM - ECRM - is built to drive sales, not sales teams. Build personal, profitable customer relationships at scale with Drip. They’re a lot like you. They believe in working hard, lending a hand wherever they can, never settling for …

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69Testimonials

  • "Customer.io makes it easy for Handy to create a personalized customer journey with detailed targeting and dynamic workflows, and our account manager is super responsive and goes out of her …

    Anna Mayer Sr Marketing Manager

  • "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
68 more testimonials currently locked

29 Case Studies

  • ZEN.COM boosts active users by 50% through targeted user segmentation and a …

    Michał Dąbrowski Communications & Product Growth Manager

  • Bamboo doubled conversion rates: The power of multi-channel messaging

    Ugo Iwuchukwu Head of Marketing & Partnerships

  • How Kinnect.Club built personalized ai-driven campaigns with Customer.io

    Omar Alvarez Founder
28 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 29 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 1,907,669+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.