Customer.io

Customer.io is a data-driven customer engagement platform that enables product and marketing teams to send personalized, behavior-triggered messages across email, push notifications, SMS, and in-app channels. Founded in 2012, it serves over 9,000 brands with a visual workflow builder, real-time segmentation, and A/B testing built on first-party customer data. The platform is designed for mid-market SaaS, fintech, and mobile app companies that need granular control over automated customer communications. Customer.io is a remote-first company headquartered in Portland, Oregon, and was named to the Inc. 5000 fastest-growing private companies list in 2024.