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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 1749 reference ratings
4.8/5.0 (1749)
  • 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

  • “When we were on MailChimp, we had severe deliverability issues for 2 reasons. The first being that we weren’t able to be on our own dedicated IP like we’re able …

    Anthony Aurrichio Senior Manager, Digital Engagement

  • "Across all of our events, we send close to 1,000 unique event properties to Customer.io. They offer us the unique opportunity to leverage all of these properties to further personalize …

    Lucas van den Houten StuDocu

  • “Our team is so pleased with our choice to switch our email marketing platform to Customer.io! They have a team of Email and Deliverability experts who will help you create …

    Stephanie Vazquez Email Marketing Specialist
68 more testimonials currently locked

29 Case Studies

  • How GNC Mexico uses Raidar.io and Customer.io to drive in-store sales

    Marcelo Martinez Founder & CEO

  • How StuDocu keeps their 15 million global monthly users engaged

    Martine Peeters Marketing and Communications Manager

  • How Mysa Revved up their Revenue by 592% Through Email Marketing

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 1,911,840+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.