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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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  • 60 Testimonials View
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Customer Rating Review Score based on 1675 reference ratings
4.8/5.0 (1675)
  • Winter 2025 Top Performer Transactional Email Software
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60Testimonials

  • “The multi-channel approach allows us to test and refine our strategies through A/B testing, helping us understand what value propositions motivate our users. It’s boosting user engagement connection in general.”

    Michał Dąbrowski Communications & Product Growth Manager

  • “One of the biggest successes I’ve seen with Customer.io is being able to have multiple teams use the platform to generate value. Because the UI is so intuitive, anyone can …

    Jorge Alonso Marketing Manager

  • “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
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21 Case Studies

  • Klar - Customer Case Study

    Diego Schocher Business Architect

  • How Musora Combats Churn with Customer.io

    Randy Epp Product Director

  • How LES MILLS+ transformed customer retention with a winning strategy

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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 1,901,805+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.