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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
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Customer Rating Review Score based on 1687 reference ratings
4.8/5.0 (1687)
  • 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

  • “I never run into situations where I think something isn’t possible to do with Customer.io, I can always adjust everything just the way I want it, and what I want …

    Marnix Broer Co-Founder

  • "Customer.io lets us move at event speed. Every lead gets instant attention while we stay focused on real conversations. The moment someone scanned our QR code, Customer.io took over. No …

    Tijn van Daelen Co-Founder

  • “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.”

    Ugo Iwuchukwu Head of Marketing & Partnerships
68 more testimonials currently locked

29 Case Studies

  • Sealing the deal on seamless, scalable messaging automation

    Alex Vale Head of Growth

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

  • How Kinnect.Club built personalized ai-driven campaigns with Customer.io

    Omar Alvarez Founder
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 1,907,669+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.