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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 1792 reference ratings
4.8/5.0 (1792)
  • Winter 2026 Top Performer Transactional Email Software
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69Testimonials

  • “Through data analysis within Customer.io, we’re able to learn about our lead acquisition strategy and understand whether it’s worth it to focus on a specific group or tactic, and if …

    Mysa Performance Marketing Manager

  • "We send thousands of requests a day through Customer.io to update different attributes, and it’s always worked. We love it."

    Justin Searles Senior Fullstack Engineer

  • "We have been using Customer.io since 2015. It’s a flexible and powerful platform, which makes our messaging more effective for us and our sponsors. Customer.io’s an important partner for our …

    Doug Hexter Chief Executive Officer
68 more testimonials currently locked

34 Case Studies

  • How BallerTV used multi-channel personalization to up-level their marketing

    Brendan Baker Director of Growth Marketing

  • How Final Round AI boosted feature engagement by 23%

    Kaivan Dave Chief Marketing Officer

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

    Sophie Gil Audience Development Lead
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 1,954,622+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.