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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 1705 reference ratings
4.8/5.0 (1705)
  • 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

  • "Customer.io gives us leverage. Two founders can run follow-up at the scale of a full growth team. The workflow felt like having an extra teammate who never gets tired."

    Gijs van de Nieuwegiessen Co-Founder

  • "We send every single customer profile from our database and pipe it into Customer.io. And it has been so easy! Being a subscription company, your customer’s status changes all the …

    Michelle Ballen Director of Growth

  • “We know how important data is. Not only that, but to own your own data. That’s why we chose Customer.io.”

    Daniel Sand Chief Executive Officer
68 more testimonials currently locked

29 Case Studies

  • Locking Users into Segments to Unlock 20% of Monthly Upgrades

    Sharon Blatt Cohen Senior Marketing Lead

  • How Creativeo more than doubled their open rates in 30 Days

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

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 1,910,616+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.