Precision farming has significant potential to improve agricultural performance, ranging from improved use of crop nutrients, to increased crop quality, reduced overlaps and better production economy. Benefits are mainly gained from reduced overlap, yield improvements or pesticide cost reductions. In this study, a generic web app to assess the costs, benefits and environmental performance of precision farming on different farms was developed. This tool will assist farmers or advisors through a guided process that allows the evaluation and comparison of precision farming technologies with conventional systems. It will convey a specific assessment process in which the farmer is guided through a step-by-step approach. The tool is validated by means of different case studies involving small and medium farms from different rural areas of the participating countries (Denmark, Italy, and Switzerland). To extract and update national and regional data from farms (i.e., farm sizes, input costs), the database is conveniently linked to external databases. The app will allow users to retrieve information regarding independent and combined technologies, as well as its financial and environmental performance at an operational level. The trial version displays information through an interactive interface in the form of tables, charts, maps and reports. This study indicates that precision farming is mainly beneficial to large-scale farms when combined with the integration and application of different tools.