Requirements analysis is an important phase in a software project. Automatic evaluation of Natural Language (NL) requirements documents has been proposed as a means to improve the quality of the system under development. QUARS EXPRESS is an automatic analyzer of Natural Language (NL) requirements able to manage complex and structured requirement documents containing metadata, and to produce an analaysis report rich of informations that points out linguistic defects and indications about the writing style of NL requirements. This tool demonstration paper introduces the ideas behind QUARS EXPRESS. 1 QUARS EXPRESS QUARS EXPRESS presents a GUI that allows the user to perform the time-consuming analysis in a click. Figure 1 presents it with respective elements. The main features of this tool are described in the following list: