it's really useful for what I need it for

I rely on Customer.io as our core email hub for complex, personalized automation journeys and large-scale batch automation.

I use Customer.io to send email, push, and in-app messages to users of my meditation app. Email deliverability is a big one for me, and I like having customer data and segmentation in one place so I can email specific groups. It’s easy to configure and send broadcasts to my whole list, including at specific times of day, which increases open rates. The flow is a good user experience, and the content design dashboard is well thought out and easy to use. I can write an email in a few minutes and send it to tens of thousands of people. It’s valuable to share information easily, and sometimes I can make a lot of money by sending an email when I’m selling something. I was really happy when RevenueCat and Customer.io set up a direct integration, so subscription data comes over seamlessly. Customer.io also connects directly to my Flutter app through its SDK, which sends event data. Compared with Mailchimp, Customer.io had more functionality for my mobile app, was easier to integrate into my tech stack, and was significantly cheaper. The initial setup was very straightforward, and I’d rather use Customer.io’s SDK than Segment’s.