Pareek, A. et al. 2026. APEX: Adaptive Personal EXperience Agents A Cost-Efficient, Privacy-Preserving Architecture for Scalable AI Assistants. The Eastasouth Journal of Information System and Computer Science. 3, 03 (Apr. 2026), 381–390. DOI:https://doi.org/10.58812/esiscs.v3i03.935.