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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 1730 reference ratings
4.8/5.0 (1730)
  • 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

  • “We know how important data is. Not only that, but to own your own data. That’s why we chose Customer.io.”

    Daniel Sand Chief Executive Officer

  • “The biggest change we’ve made is our audience segmentation. We’re now seeing which audiences are performing well and increasing budgets accordingly, and decreasing spend where we haven’t seen as much …

    Kunal Arya Leads Paid Marketing Efforts

  • “The Pro Services team at Customer.io was critical in expediting our migration to their platform. They were communicative, experts in the platform, and incredibly efficient. Without their help and flexibility, …

    Jamie Quint Head of Growth
68 more testimonials currently locked

29 Case Studies

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

    Jorge Alonso Marketing Manager

  • Locking Users into Segments to Unlock 20% of Monthly Upgrades

    Sharon Blatt Cohen Senior Marketing Lead

  • How Nordnet scales trust, inspiration, and engagement with Customer.io

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 1,911,112+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.