Analytics backend-as-a-service lets developers build analytics features directly into apps.
http://keen.io/
Analytics and Tracking · Application Performance
Get access to data on 251,777 websites that are Keen IO Customers. We know of 28,629 live websites using Keen IO and an additional 223,148 sites that used Keen IO historically and 24,110 websites in the United States.
Get a list of 251,777 websites using Keen IO which includes location information, hosting data, contact details, 28,629 currently live websites and an additional 56,824 domains that redirect to sites in this list. 223,148 sites that used this technology previously and 24,110 websites in the United States currently using Keen IO.