CompareCare, Massachusetts’ online price transparency initiative, was recently launched by the Center for Health Information and Analysis.1 Designed with the public in mind, CompareCare is home to in-state cost, quality, and safety data on multiple medical procedures.1 The latest state to institute an online consumer-directed resource, Massachusetts is but one of many entrants into a rapidly expanding national field. A total of 28 states enacted statutes mandating health care price transparency tools.