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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 1770 reference ratings
4.8/5.0 (1770)
  • Winter 2026 Top Performer Transactional Email Software

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69Testimonials

  • “With Customer.io, we tailor our messaging to our audience. We don’t talk down to experienced investors, and we take time to explain complexities to newcomers. We’re maximizing impact.”

  • “Creativeo’s client improved their average unique open rate by 147% by implementing Customer.io’s email deliverability plan in only 30 days.”

  • "If we get people to the ah-ha moment of connecting their email, they’re more than twice as likely to find value within 30 days. That’s far and away the biggest …

68 more testimonials currently locked

29 Case Studies

  • Sealing the deal on seamless, scalable messaging automation

  • Klar - Customer Case Study

  • 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.