Yes and no. Zillow offers free online home valuation service for any property in the country. You enter the address and it provides an aerial view of the property with a dollar value of the property. Zillow is as good as the information it relies on, and sometimes that information does not tell the full picture of a home’s value. For example, if you have refinanced for an amount that is lower than the property’s market value, Zillow shows the refinanced amount because that is the information publicly available.
What you can get from Zillow is a ballpark value of a particular home and homes in the neighborhood. It also shows homes (designated by flags) that have recently sold plus the sales amount, and homes up for sale. While the site is not perfect yet, it is worth consulting when looking to buy a home.