Gemius is a research and technology company headquartered in Warsaw, Poland, with offices in several Central and Eastern European markets. Its Prism product provides web and app traffic measurement and analytics, and the group also offers audience measurement across internet, TV, radio and outdoor media. Publishers, agencies and brands use these services to measure audiences. The company was established in 1999.
For a European organisation this is a Polish company inside the EU. Gemius states that it ensures compliance with EU privacy laws for all companies in the Gemius Group, while noting that policies can differ by country and that a binding statement for a specific country can be requested from the company. The ownership structure and the hosting location of customer data are not stated in public sources and should be checked directly with the vendor. No open-source or self-hosted version is described.