The ever-evolving landscape of psychological and social sciences research continues to present researchers with new vistas of understanding human behaviour. One of the crucial aspects of this exploration involves comparative studies, for instance pitting the Patient Health Questionnaire (PHQ-9) against the Eysenck Personality Questionnaire (EPQ). However, the process of harmonisation between these two can be time-consuming and subjective. Enter Harmony, the AI-powered tool that simplifies the comparison of PHQ-9 and EPQ. Harmony, built on natural language processing and generative AI models, offers researchers an intuitive interface and a massive database of instruments including PHQ-9 and EPQ for cross-comparison. You can simply drop your PDFs into its web interface and let the Harmony magic begin. The technology compares the PHQ-9 vs EPQ at an itemized level, assigning percentage matches to identify high correspondence or divergence. This facilitates within-study and across-study comparisons for a wider perspective on the findings. In mental health research, comparative studies like PHQ-9 vs EPQ are immensely consequential in shaping socio-health policies and interventions. As such, the harmonisation process deserves the kind of detail and ease that tools like Harmony can provide. Overall, the PHQ-9 vs EPQ comparative study gains an unprecedented edge with Harmony, moving us increasingly closer to capturing the full complexity of human experience.