1. A system for summarizing differences between versions of a web page, the system comprising one or more computing devices programmed to at least: determine one or more differences between a plurality of versions of a web page, wherein each of the plurality of versions is created at a different time; and cause display of an object graphically summarizing a measurement of differences between the plurality of versions of the web page with respect to time, wherein the object comprises one or more graphical indicators representing the measurement of differences in the web page over a period of time.