Understanding the similarities and differences between the 12-item General Health Questionnaire (GHQ-12) and the Michigan Alcoholism Screening Test (MAST) is crucial for many psychologists and researchers. The process, known as harmonisation, can be laborious and time-consuming. But with Harmony, the innovative tool developed with natural language processing and AI models, this task becomes considerably simpler. Harmony is specifically designed to streamline the comparison process of ‘GHQ 12 vs MAST’, even if the questionnaires are in different languages. In the comparison of ‘GHQ 12 vs MAST’, Harmony stands out with its ability to provide a percentage match between each item in these questionnaires. This not only saves time and effort but also provides an objective and quantitative measure to the comparison. With Harmony’s user-friendly interface, psychologists can directly upload or select from Harmony’s database, both GHQ 12 and MAST questionnaires, making the process highly convenient, efficient, and reliable. Harnessing the power of large language models, Harmony manages the comparison of GHQ 12 vs MAST in a smart and sophisticated manner. The tool’s ability to detect patterns and infer meanings amidst different languages further enhances its application and relevance in cross-cultural research contexts. Therefore, using Harmony for comparing ‘GHQ 12 vs MAST’ or other similar instruments can significantly enrich the analysis by offering precise and objective assessments, making Harmony an indispensable tool in psychology research.