The home values found on sites like Zillow, Trulia, Realtor.com, and Redfin, are determined by the site’s individual computer-generated algorithms. Keep in mind that these computers have not been inside your house. In addition to that, these sites rely on public data to determine home values and therefore are extremely inaccurate. These sites do not have access to the private data that the Multiple Listing Service in Indiana uses to determine accurate home values.