My startup, Apptegic, www.apptegic.com is building a "user retention as a service" service. On a per-user basis, we can track events, patterns of events, and business usage (like # of photo batches sent). We can combine these to score engagement and we can segment and filter groups of users based on these combinations.

There are lots of other ways our Beta customers are using this info already. But many have asked for the ability to do targeted emails based on usage and engagement. We don't have email system integration into MailChimp, Constant Contact, and others like Paul described yet but we are working toward it.

Do you have suggestions on what a a minimal viable email system integration would be? Let people script a download of the list of emails that fit a criteria and script upload that into their mail system of choice?

If you have suggestions please comment below or contact me at kwirth at apptegic dot com.