This free tool in AdWords can show you what happens after customers click your ad (for example, whether they purchased your product, called from a mobile phone or downloaded your app).
https://support.google.com/adwords/answer/1722054
Analytics and Tracking · Conversion Optimization · Conversion Tracking
Get access to data on 8,001,033 websites that are Google Conversion Tracking Customers. We know of 1,982,841 live websites using Google Conversion Tracking and an additional 6,018,192 sites that used Google Conversion Tracking historically and 793,351 websites in the United States.
Google Conversion Tracking websites that are also using other technologies.
Get a list of 8,001,033 websites using Google Conversion Tracking which includes location information, hosting data, contact details, 1,982,841 currently live websites and an additional 2,485,583 domains that redirect to sites in this list. 6,018,192 sites that used this technology previouslyand 793,351 websites in the United States currently using Google Conversion Tracking.
Countries
Financial
Group
Region