According to their website, Customer.io is a behavioral messaging platform for automating hyper-personalized customer communication at scale. Harnessing real-time behavioral data and advanced segmentation across web and mobile channels, Customer.io empowers marketers to automate targeted, contextually-relevant communication that optimizes the customer experience while driving retention and conversion. Founded in 2012, Customer.io is headquartered in Portland, Oregon, with a growing team across the US, Canada and Europe. Some people appear to love Customer.io for it’s flexibility but caution that it’s not all out of the box, requiring some developer time to really get the most out of your Customer.io experience. Customer.io is built to trigger emails based on events, rather than just pageviews.
They also offer a free plan