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Customer.io

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Read 60 Customer.io reviews and testimonials from customers, explore 21 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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Customer Rating Review Scorebased on 1339 reference ratings
4.8/5.0 (1339)
  • Top Performer 2025 2025
    Winter 2025Top PerformerTransactional Email Software
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60Testimonials

  • "Our initial onboarding email campaign for totally new new leads that come in from the giveaways introduces our service and leads users to fill out a form. People who click through and fill out the form are more qualified leads, so they enter a different campaign that’s focused on giving them a promo code and trying to get them to book as fast as possible."

    Claire ZhangGrowth Lead
59 more testimonialscurrently locked

21 Case Studies

  • RushOrderTees 1 new Customer.io feature, 140% revenue increase

    Matt HayesEmail Marketing Manager
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1 Customer Videos

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Additional Customer.io Information & Resources

Read Customer.io Reviews, Testimonials & Customer References from 60 real Customer.io customers.

Browse Customer.io Case Studies, Customer Success Stories, & Customer References from 21 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 1,809,433+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.