Customer.io is a platform for sending targeted messages. Messages become more personal with Customer.io as they are perfectly times and triggered with an advanced rules engine. This feature rich system allows you to measure your success with opens, clicks and conversions. A light integration sends the Customer.io platform user data from your web or mobile app. Then you can start sending emails based on what people do or don’t do after they log in. Increase engagement, revenue, and customer success with intelligent messaging. A free version is available. The priced version starts at $50 per month up to $1250. A discount is offered if fees are paid annually.