This is a preliminary scan of publically available online health care datasets, transparency websites and tools, gathered from expert recommendations and intensive review. Though this list is not exhaustive, we have attempted to include the most relevant sources for the purposes of this study. Each health data source is assigned an icon representing (1) who the source is useful to i.e. consumers or researchers; (2) what information the source includes i.e. data pertaining to quality of care or cost of care; and (3) who the source provides information on i.e. providers or payers.