The BEST way that I've found so far is Intercom (https://www.intercom.io/ https://www.intercom.io/) not only are we using Intercom to talk to our early users, w

The BEST way that I've found so far is Intercom (https://www.intercom.io/ https://www.intercom.io/) not only are we using Intercom to talk to our early users, we are pulling metrics from Mixpanel and our own database into Intercom in order to communicate with users who are at different stages in the lifecycle. For example, we do some analysis nightly to see if a user is 'active' and if they are we update the intercom custom data property for that user, we can then do really complex types of messaging to our users such as: 'When a user who is active and created at least 3 widgets has not logged in in a week, send them an email'. Major props to Des and the whole team at Intercom.