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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
  • 21 Case Studies View
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Customer Rating Review Score based on 1661 reference ratings
4.8/5.0 (1661)
  • Winter 2025 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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60Testimonials

  • “Not only is the interface super easy to use, but it integrates with our data warehouse securely. All that data is now at our fingertips, so we can send relevant …

    Nicole Jacobson Director of Marketing

  • “We’ve long needed the ability to create advanced nurture flows that can send our contacts down more personalized paths."

    Michael Roberts Head of Marketing Automation

  • “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
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21 Case Studies

  • How Mido Lotto hit the jackpot with 3x conversion with SMS

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

    Matt Hayes Email Marketing Manager

  • 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 1,900,132+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.