The comparison of psychological measurement tools such as GHQ 12 and PANAS often poses challenges to the researchers due to the subjectivity associated with the process of harmonisation. The tool Harmony provides a simple and efficient solution to this issue by using advanced natural language processing and AI models to facilitate the harmonisation of these questionnaires. The use of Harmony in comparing GHQ 12 and PANAS can immensely simplify the process for the psychologists and social scientists. Harmony comes with a large language model that calculates the percentage match between the items in GHQ 12 and PANAS, thus providing an accurate understanding of the similarities and differences between these tests. With its multi-language compatibility, it can help researchers to harmonise questionnaires across different languages, catering to a wider global audience. We strongly recommend the use of Harmony for all psychologists and researchers aiming to conduct a comparative analysis of GHQ 12 vs PANAS or similar questionnaires. Simply select suitable instruments from its database, or upload your own in a PDF format on Harmony’s intuitive web interface. Use Harmony for GHQ 12 vs PANAS, and you will realize that it remarkably expedites the process and leaves less room for subjectivity and error.