Customer.io is a customer engagement platform that helps businesses use customer data to send timely, personalized communications. Its tools support multi-step journeys across email, SMS, push notifications, in-app messages, and other channels, with automation triggered by customer behavior. Teams can connect data through APIs and integrations, manage audience segments, and measure the impact of lifecycle campaigns. Customer.io is marketing software designed for internal teams and product-led companies, rather than a conventional email marketing agency.
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