Intercom.io is similar. Intercom.io is seen as a service to help retain your customers. Though there are overlaps, our focus is to build an API that makes it easy to configure any kind of rule to trigger messages.

We hope to make it easy to configure rules like "send an email if a customer's total order value crosses $1000" or "Send a reminder if a customer's activity over a week is lower than their average" and so on.