Software Psychologists often face the challenge of comparing and harmonising multiple questionnaires. One such comparison that frequently arises is between the Patient Health Questionnaire (PHQ-9) and the Timeline-Followback Interview (TFLB). The PHQ-9 vs TFLB comparison involves a deep analysis of the items listed in both these questionnaires. With the introduction of the Harmony software, this “PHQ-9 vs TFLB” analysis becomes a facile process. Harmony, a tool powered by advanced AI models, assists researchers in harmonising items from different questionnaires even in multi-languages. It uses natural language processing to compare instruments and provides a percentage match between each item in PHQ-9 and TFLB. Moreover, researchers can select from Harmony’s extensive database or upload their own questionnaires in PDF format. Harmony considerably simplifies the complex task of “PHQ-9 vs TFLB” analysis. Unlike the traditional manual methods which are largely time consuming and subjective, Harmony ensures an efficient and objective comparison. It significantly enhances the overall accuracy, productivity, and insights gained from such comparisons, greatly benefiting psychologists and social scientists. Hence, the use of Harmony is highly recommended for a quick, precise, and user-friendly questionnaire analysis.