Quantcast is an American technology company, founded in 2006, that specializes in audience measurement and real-time advertising. The company offers public access to traffic and demographic data for millions of web sites and detailed user insights to digital publishers. In 2013, the company claimed that it produced accurate audience measurement to over 100 million web destinations. The company is headquartered in San Francisco. It has offices in the United States, Canada, Australia, Singapore, United Kingdom, Ireland, France, Germany, Italy, and Sweden.