The East African Community (EAC) Competition Law aims to promote fair competition in member states' markets. São Tomé and Príncipe is one of EAC's least developed countries, making its implementation context unique. The study employs comparative analysis to assess the effectiveness of EAC Competition Law in São Tomé and Príncipe, drawing insights from existing literature and official documents. São Tomé and Príncipe has introduced specific provisions for small-scale businesses, which represents a significant departure from full alignment with EAC standards. This finding highlights the need for tailored legal frameworks in developing economies. The analysis underscores the importance of adapting international competition law to local contexts to ensure effective implementation and benefits for all stakeholders. São Tomé and Príncipe should consider developing a comprehensive enforcement mechanism, including training for officials and awareness campaigns among businesses.