Document consumption and value add service techniques and systems are described. In one example, a digital medium environment is configured to control availability of a value add service to consumers of a document. Consumption data is collected from a plurality of client devices. The consumption data describes characteristics of consumption of the document by respective client devices. A readership index is calculated that describes an amount of overall consumption of the document by the plurality of client devices. Responsive to a determination by the computing device that the readership index has exceeded a threshold, the value add service that relates to the document is exposed for interaction by at least one of the plurality of client devices.