Patent databases are databases which also represent the largest aggregate of descriptions of the humanities’ technological achievements. Searching patent records, which provide a source of information on the continually complementing technological development over the past 200 years, enables us to analyse and determine the stage of development of a certain technology. Several quantitative and qualitative patent evolution analysis methods have been developed with the goal of easier development stage assessment, however, they are not automated or widespread enough. A user interface that would be able to present a technology’s development stage visually would greatly ease a user’s decision on investment in a certain product or technology. This paper discusses invention analysis methods to provide a better understanding of technology evolution and describes the developed web-application which visually presents qualitative patent evolution analysis methods.