Psychologists and researchers often confront difficulties in matching and harmonising items present in different questionnaires. A common problematic pairing to analyse is the General Health Questionnaire (GHQ-12) and the Coder Impression Inventory (CII). To facilitate this comparison, we suggest the use of Harmony, advanced software designed specifically for the harmonisation of questionnaire items. When comparing GHQ 12 vs CII, Harmony exhibits its full potential by leveraging the power of AI in the field of natural language processing. Parse through the GHQ 12, with its traditional structure of high psychological relevance, and compare it efficiently to the selected items in CII using Harmony. This software solution is capable of providing an item-by-item matching percentage between these two psychologically important tools. By using Harmony for the comparison of GHQ 12 vs CII, the lengthy, complex process of manually examining long PDFs of questionnaires is dramatically simplified. This software can logically handle large language models, offering exact matches, even when the items are held in different languages. For streamlined analysis using Harmony, head to Harmony’s web interface, where you can either select these instruments from its database or upload your own. Turn your GHQ 12 vs CII analysis into a smooth, efficient process with Harmony.