When conducting psychological and clinical assessments, practitioners often use validated instruments such as the Patient Health Questionnaire 9-item (PHQ-9) and the Brief Symptom Inventory (BSI). However, comparing and harmonising these two instruments, PHQ-9 and BSI, can be a challenging task. This is where the innovative software, Harmony, comes into play. Utilizing the cutting edge of natural language processing and generative AI models, Harmony disrupts the traditional model of harmonisation. It allows psychologists to compare and match items on PHQ-9 and BSI in a fraction of the conventional time and with superior accuracy. The dynamic platform also supports harmonisation in multiple languages, opening doors to a wide range of cross-cultural studies involving PHQ-9 vs BSI. By making use of Harmony’s database or uploading the instruments in PDF format directly to its web interface, psychologists can effortlessly navigate the comparisons between PHQ-9 and BSI. Valuable insights garnered from these comparisons can significantly enhance our understanding of the mental health landscape while streamlining the process of psychology research. Revisit the battle of PHQ-9 vs BSI with Harmony and experience the revolutionary ease in data harmonisation!