<![CDATA[This study aimed to evaluate the user interface of the Shopee application using the heuristic evaluation method based on Nielsen’s ten principles. The evaluation was conducted through an online questionnaire distributed to 35 active Shopee users. Each item in the questionnaire represented a specific heuristic principle and was rated using a Likert scale. The data were analyzed by calculating the average scores of each item and each principle, followed by severity rating computation derived from user satisfaction scores. The results revealed that the “Flexibility and Efficiency of Use” principle had the highest score, while “Error Prevention”, “Consistency and Standards”, and “Aesthetic and Minimalist Design” had the highest severity levels. These findings indicate that while the Shopee interface generally adheres to key usability principles, several critical aspects still require improvement. This study offers practical insights for the development of a more user-friendly and responsive interface.Keywords: Heuristic evaluation; User interface; Shopee application; Severity rating; UsabilityAbstrakPenelitian ini bertujuan untuk mengevaluasi antarmuka aplikasi Shopee menggunakan metode heuristic evaluation berdasarkan sepuluh prinsip Nielsen. Evaluasi dilakukan melalui kuesioner daring yang disebarkan kepada 35 pengguna aktif Shopee. Setiap butir pernyataan pada kuesioner mewakili prinsip heuristik tertentu dan dinilai menggunakan skala Likert. Data dianalisis dengan menghitung nilai rata-rata tiap pertanyaan dan tiap prinsip, serta dilengkapi perhitungan tingkat keparahan (severity rating) berdasarkan skor kepuasan pengguna. Hasil menunjukkan bahwa prinsip Flexibility and Efficiency of Use memperoleh skor tertinggi, sedangkan Error Prevention, Consistency and Standards, serta Aesthetic and Minimalist Design mencatat nilai severity tertinggi. Temuan ini mengindikasikan bahwa meskipun antarmuka Shopee secara umum telah memenuhi sebagian besar prinsip usability, masih terdapat beberapa aspek penting yang perlu diperbaiki. Penelitian ini memberikan masukan aplikatif untuk pengembangan antarmuka yang lebih responsif dan ramah pengguna. ]]>
