Nota Fiscal Gaúcha-NFG Oficial is a free Android application developed by PROCERGS under the category of Social & Communication. It is a citizenship program of the State of Rio Grande do Sul that encourages citizens to demand the issuance of tax documents at the time of their purchases. The program distributes prizes and helps charities with the goal of promoting social welfare.

The program is easy to use, and citizens can register their tax documents to participate in the program by scanning the QR code on the receipt, manually entering the invoice number, or using their CPF (Individual Taxpayer Registry). Once registered, participants can check the points accumulated and the prizes offered, as well as choose a charity to support. NFG also provides news and information about the program and its benefits.