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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 1418 reference ratings
4.8/5.0 (1418)
  • Top Performer 2025 2025
    Winter 2025Top PerformerTransactional Email Software

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60Testimonials

  • "Customer.io has been a critical part of our onboarding process since the very early days of Segment. From the 43-minute founder email to much more complex challenges today. We’re continually improving our onboarding strategy."

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21 Case Studies

  • ZEN.COM boosts active users by 50% through targeted user segmentation and a strong value proposition

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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.