Comparing two distinct psychological questionnaires such as the Patient Health Questionnaire (PHQ-9) and the Child Eating Behavior Questionnaire (CEBQ) can pose significant challenges. The task becomes even more daunting without a harmonising tool. This is where Harmony, with its automated questionnaire comparison feature, steps in. With its impressive capabilities, PHQ-9 vs CEBQ becomes a less complicated endeavour, empowering psychologists and researchers to focus on the bigger picture. Harmony’s large language models and natural language processing tools allow it to analyse the language and context of each item within PHQ-9 and CEBQ, providing a percentage match between the two instruments. This feature of Harmony turns the PHQ-9 vs CEBQ comparison a simple and seamless process. Moreover, the database of Harmony is quite extensive, so researchers have the freedom to either choose from pre-loaded questionnaire instruments or upload their PDF files for direct comparison. The multilingual feature of Harmony is a bonus, making the PHQ-9 vs CEBQ comparison viable across multiple languages. To use Harmony, simply drag and drop the questionnaire files into the Harmony’s web interface or select from the existing database. Make the most of your longitudinal studies by leveraging this intelligent tool, Harmony, for all your harmonisation needs. Explore the convenience of automated harmonisation and redefine your comparative research experience with PHQ-9 vs CEBQ.