Vipul Patel v. Zillow, Inc.

Easterbrook, Circuit Judge.

A Zestimate is an estimated value for real estate, available on the Zillow web site for about 100 million parcels. Zillow generates Zestimates by applying a proprietary algorithm to public data, such as a building's location, tax assessment, number of rooms, and the recent selling prices for nearby parcels. But because Zillow does not inspect the building, it cannot adjust for the fact that any given parcel may be more attractive and better maintained, raising its likely selling price, or the reverse. Zillow states that its median error (comparing a Zestimate with a…