This book constitutes the proceedings of the 8th International Conference on End-User Development, IS-EUD 2021, held in July 2021. Due to COVID-19 pandemic the conference was held virtually.The paper track received 26 submissions, of which 11 full and 4 short papers were selected after a rigorous double-blind review process. The papers focus on "Democratizing AI development", namely on EUD for AI-based systems, where end users are called-on to become end-user developers of intelligent agents, digital twins, collaborative systems and social robots.