Web search engines are listed in tables below for comparison purposes. The first table lists the company behind the engine, volume and ad support and identifies the nature of the software being used as free software or proprietary software. The second and third table lists internet privacy aspects along with other technical parameters, such as whether the engine provides personalization (alternatively viewed as a filter bubble).
^The results of the search are arranged for the user in accordance to their interests as determined from previous search queries or other information available to the search engine.
^ abcdCannot be verified independently, as the information is handled by servers not accessible by the public.
^"SEC Filing 2011"(PDF). Form 20-F. Our search index includes billions of webpages..: Yandex N.V. 31 December 2011. p. 45. Archived from the original(PDF) on 16 June 2012. Retrieved 21 April 2012.