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 255,922 websites that are Keen IO Customers. We know of 35,639 live websites using Keen IO and an additional 220,283 sites that used Keen IO historically and 29,300 websites in the United States.
Get a list of 255,922 websites using Keen IO which includes location information, hosting data, contact details, 35,639 currently live websites and an additional 68,666 domains that redirect to sites in this list. 220,283 sites that used this technology previously and 29,300 websites in the United States currently using Keen IO.