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 7,607,873 websites Google Conversion Tracking Customers. We know of 1,959,447 live websites using Google Conversion Tracking and an additional 5,648,426 sites that used Google Conversion Tracking historically and 777,620 websites in the United States.
Google Conversion Tracking websites that are also using other technologies.
Get a list of 7,607,873 websites using Google Conversion Tracking which includes location information, hosting data, contact details, 1,959,447 currently live websites and an additional 2,540,641 domains that redirect to sites in this list. 5,648,426 sites that used this technology previouslyand 777,620 websites in the United States currently using Google Conversion Tracking.
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