Product4 is a specialized GPT tool designed for the in-depth analysis of products and the delivery of strategic insights from an expert perspective. Created by KEIJIROU ASANO this tool offers a unique interface for engaging with the underlying ChatGPT model to facilitate meaningful discussions on products. Its versatility allows for the assessment of popular applications the analysis of platforms such as Twitter and the evaluation of applications favored by younger demographics. In addition to these examples Product4 can be utilized for any product-related inquiries providing users with expert viewpoints and strategic analyses. Users are encouraged to initiate discussions regarding their products for analysis and guidance. Access to ChatGPT Plus is required to utilize this tool which aims to equip users with essential knowledge on various products their strategic significance and potential avenues for optimization and growth.