In the field of psychology and behavioural science, comparing different personality assessments or psychological questionnaires is essential for comprehensive analysis and diagnosis. Among those widely used and acknowledged are the Strengths and Difficulties Questionnaire (SDQ) and the Affective Reactivity Index (ARI). However, drawing comparisons manually between SDQ and ARI can be laborious and time-consuming. Harmony, a tool powered by natural language processing and AI, presents the perfect solution for psychometric comparisons such as SDQ vs ARI. It enables psychologists to compare each item in SDQ with that in ARI, providing a percentage match for each pair. This simplifies the process of harmonising and comparing different instruments, turning the previously daunting task of comparing SDQ vs ARI into a manageable and automated task. The great advantage of using Harmony for SDQ vs ARI comparison is its capability to handle multiple languages. It also allows you to drag and drop your own instruments in PDF form. With a database featuring varied testing instruments ready for use and comparison, Harmony offers a nuanced and in-depth approach in behavioural studies. This makes tools like Harmony indispensable in this era of fast-paced research and broad multi-lingual and multicultural analysis.