Email people automatically based on what they do (or don't do) in your app.
https://customer.io/
Analytics and Tracking · Marketing Automation
Get access to data on 29,654 websites Customer.io Customers. We know of 9,223 live websites using Customer.io and an additional 20,431 sites that used Customer.io historically and 5,749 websites in the United States.
Get a list of 29,654 websites using Customer.io which includes location information, hosting data, contact details, 9,223 currently live websites and an additional 31,425 domains that redirect to sites in this list. 20,431 sites that used this technology previouslyand 5,749 websites in the United States currently using Customer.io.
Countries
Financial
Group
Region
These are sites that we think might use Customer.io in the future because of their similarity to other sites that already do.