ClearBrain - Predict which users will upgrade or churn tomorrow.
The Big Book of Churn - The definitive guide to customer churn reduction
ChurnKit - Find out who removed your service from their website.
Customer.io - We make it easy to send emails triggered by user behavior. Build, measure and improve your emails to activate and retain users
Lookback Live - Real-time user research on mobile and desktop 🕵 ✍️
Postmark - Postmark is the easiest and most reliable way to be sure your important transactional emails get to the inbox. Simply & reliably parse recieved email to JSON for your webapp.